Heater ticking sound

Bob_98SR5 · 01-01-2004, 06:11 PM

Guys,

Ah, I hate annoying stuff like this. Today after meeting Steve (Robinhood) and Miki for lunch, the wife and I were driving back. We turned on the heater and we hear this faint, consistent ticking noise. It sounds like a plastic gear sound. We figured out it was a result of the heater being turned on b/c when we turned it off, the sound went away.

Anyone have or had a similar problem and fixed it?

Thanks,
Bob

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Highland Runner · 01-02-2004, 04:50 AM

I had this type of problem and I'll tell you what it was. A mouse had made a nest in the fan unit. The fluff and stuff was inside the fan and little pieces were sticking through hitting the sides as it turned. I also had a Tacoma where leaves had made their way into the fan from the cowl. The twigs stuck through the fan making a clicking sound as it turned. This problem was intermittent until I fixed them. I guess the pieces sticking through broke off untill another piece stuck through. Some what of a pain to get the stuff out of mine. I could only somewhat see the fan. Used a vacuum with a little tube and a piece of coat hanger to pull the stuff out. Eventually the fan on full speed will blow the rest out.

Bob_98SR5 · 01-02-2004, 04:26 PM

eeeek! a mouse! i'll have my wife do it.

one of the other odd things that i noticed today too is that when i try to move the lever to the left (recirc), it is much harder than before. there is some resistance.

i'm going to have to take this apart. well, i'm used to it so no big deal but i hope that its not one of those little plastic gears. you konw they won't sell such a little part and so you'll have to buy the whole million dollar unit.

bob

MTL_4runner · 01-02-2004, 05:24 PM

Bob, I'm afraid you will need to pull the blower motor but it will be obvious what is making the noise right away. It will also give you a chance to clean out the duct system as it is surprising how much dust and dirt gets in there.

Robinhood150 · 01-02-2004, 05:33 PM

Maybe you should send in the cat!

MTL_4runner · 01-02-2004, 05:34 PM

Quote:

Originally posted by Robinhood150
Maybe you should send in the cat!

A snake might work better.

Robinhood150 · 01-02-2004, 05:36 PM

Oh I'll fit the cat in there.

Bob_98SR5 · 01-02-2004, 06:03 PM

MTL,

Thanks, I'm going to check out my FSM tonight.

Patty was totally against the cat going in there and inspecting. Though a little catnip might persuade him.

Bob

Highland Runner · 01-03-2004, 06:00 AM

I forgot to tell you guys how I knew it was a mouse in the car. My brother and I got in to go to the store and he turns the heat on. As so as he did a piece of mouse ear comes out of the vent and lands on him. We didn't use the heat after that. The mouse was nowhere to be found when we took it apart though, just the nest.

Bob_98SR5 · 01-25-2004, 08:07 AM

Guys,

I finally got off my lazy butt and inspected the fan as MTL suggested. Sure enough, he was right. All it was were some small leaves and a twig. Here's some pics:

Twig and leaves:

And yes Jamie, the thing was filthy! I took the time to take a scrub brush to it with some mild, soapy water. I was amazed at how much dirt was in between the fan blades and the HVAC ducts:

Here it is, all clean:

To remove the fan unit, you'll need to remove the glovebox. Al lthat takes is a screwdriver and a 10mm socket. you'll also need a #25 torx bit, a flexible drill shaft (an invaluable tool---you should run out and buy one of these asap), and of course, a powered drill. There are 3 bits underneat that need to be removed. Once it falls out, you need to unclip a black harness. of course, write up coming soon.

Thanks guys. And no, no little mouse was found.

Edit: writeup here at http://www.4runners.org/articles/fan
Bob

MTL_4runner · 01-25-2004, 10:20 AM

No prob man.....thanks for doing the writeup!

**Fink** · 01-25-2004, 10:26 AM

Will this technique also work pretty much the same for the 2nd gens? I have this same problem and was about to post something on it but then I found this thread...if it will work for a 2nd Gen then I'll be doin' this shortly.

Fink

MTL_4runner · 01-25-2004, 12:26 PM

I would bet it is very similar but the fan assembly may be quite different. Look in a Haynes manual to see what your duct system looks like and how to remove the blower motor. If that is not the problem, it will at least give you a chance to clean out the fan and the ductwork.

**Fink** · 01-25-2004, 01:51 PM

Alright...thanks for the advice MTL!

Fink

2001Millrunner · 01-25-2004, 04:17 PM

my heater makes ticking noise as well, i'll take it out and inspect it as well. thanks guys, i was wondering what that was.

and it was getting very annoying

MTL_4runner · 01-26-2004, 03:08 AM

Any of you guys having any heating problems too?
Mine is not as hot now in the dead of winter.

Mossback74 · 01-26-2004, 03:39 AM

Heater not hot anymore? tell it to go on a diet and hit the gym

well, lets see, check coolant level
full?
Is thermo stuck open?
no?
Is heater core clogged? (long shot)
no?
Am I out of ideas?
YES

MTL_4runner · 01-26-2004, 04:26 AM

Quote:

Originally posted by Mossback74
Heater not hot anymore? tell it to go on a diet and hit the gym

well, lets see, check coolant level
full?
Is thermo stuck open?
no?
Is heater core clogged? (long shot)
no?
Am I out of ideas?
YES

Coolant is perfect and very clean (I flush it often)
Truck's engine shows good and hot (just under midway)
I am thinking heater core too.....maybe it is is just covered in dust/dirt/debris.

TDiddy · 01-26-2004, 04:42 AM

Great work Inspector Gadget! I've noticed that ticking on occasion too, and after seeing pics of that dirt, I'm gonna have to tear in to mine as well. Nice job with the write up!

MTL_4runner · 01-31-2004, 06:10 AM

Well I finally pulled out my blower motor and it was really not too bad as far as being dirty although when I put the clean one back in and turned it on full a whole bunch of dust blew out of the vents so there must be some increase in airflow to do that.

The blower was definately making some faint squeaking noise before and it is almost silent now so mission accomplished.

My experience was a bit different than Bob's because the screws holding the unit up to the ducts were 8mm instead of 10mm and to get it out I needed to remove the doorjam molding and the passenger side kickpanel (both very easy to do). After undoing the screws and the electrical connector, the unit just drops right down.

The other big revelation is that you can service the blower motor bearings too. The black plastic housing can be separated from the motor by undoing the 2 screws on the bottom of the motor as you can see in this pic here:

Then once those are out, you need to pry off the access cover. This is a little shield that is also on the back side of the motor (it just pops off with a screwdriver). Then you need to use a screwdriver to pry the motor out of the housing using the access hole for leverage. The motor should just slide out but it is a tight fit so take your time and don't apply too much pressure or you can crack the housing. Took me a little time but it came right out. Then when it is apart, you have access to the brushes (check them for wear) and oil the bushings. I used electric motor oil but marvel mystery oil or 3 in 1 oil will work fine too. The rear bushing has a pad for absorbing the oil so be sure to soak it thoroughly. The front bushing requires more disassembly to get at it (you need to remove the squirrel cage first). I did not go any further since it it is winter and we are screwed up here if I damage it, so I left it alone. I will disassemble it more this summer.

Another thing is that it is ok to fully submerge the blower assembly (including the motor) in soapy water or a cleaning solution (make sure to rinse with water after) as long as you let it dry thoroughly after. The motor runs on DC so technically it can even operate underwater.....no need to fear getting water in there, but again make sure to dry it out before install just to prevent rusting. You can also spay the inside of the motor with a little WD40 for some extra insurance against this.

It was definately worth doing so I hope this helps others.

cabbage · 01-31-2004, 07:39 AM

I hear a sound once a while too, there's something I can do today! Thanks guys!

keisur · 03-06-2004, 08:35 AM

You should Rev your write-up. This is how I did it this morning. Just pull the clip and pull the squirl cage. then clean the cage and I did one extra thing. take your air compressor and blow the dust out of the motor. man, when I hit it with air the first time a cloud of brownish black dust billowed out of it and continued for a good 15-20 seconds. then just reassemble and reinstall.

man, I would post thumbnails but this new system really sucks. I can't figure out how to do that the old [] type formatting doesn't work anymore. anyway, here's the pics.

MTL_4runner · 03-06-2004, 09:19 AM

Hey keisur,
Any tricks to getting the rotor off?
I tried and failed....but I didn't want to break it either (at least in the middle of winter!)
Let's hear the technique!!!

What did you use to clean off the blower cage?
It looks spotless!!

keisur · 03-07-2004, 06:15 AM

Quote:

Originally Posted by MTL_4runner

Hey keisur,
Any tricks to getting the rotor off?
I tried and failed....but I didn't want to break it either (at least in the middle of winter!)
Let's hear the technique!!!

What did you use to clean off the blower cage?
It looks spotless!!

haha, can't you see my secret sauce cleaner in the pic? just saturate it in Windex so it is completely dripping and go at it with the toothbrush.

I pulled the clip, then I wedged a metal mending plate between the motor and cage and 180 degrees on the other side I levered another mending plate (because they are wide and it distributed the load) until I saw it start working up the shaft. then I switched the two plates and levered on the other side 180 degrees, and basically kept lightly working my way around the cage while it creeped up the shaft and after a while it popped right off. there's alot of greasy dust under the cage in that cone thing that was nazty.

the trick is, the shaft has a lip on the end of it to retain the cage and that little tab on the circumference, I took a little screw driver and bent it out a little so it wouldn't catch, the snap ring squeezes that in and holds it so it's ok to flex it into the inelastic range a tad. just don't really wrench at it because you don't want it to break.

Inspired · 06-05-2004, 11:46 AM

Speaking of mice, who do you think is responsible for this?!

I bought my 4Runner used last fall, and the air output was never up to par, and it rattled a bit when I turned it on high. A few days ago, it got so bad that no air was coming out the vents and the dash was vibrating like mad.

Thanks to all your posts and Bob's awesome write-up, I took the plunge and pulled out the fan, expecting to see twigs and leaves...

-Jennifer

01-02-2004, 04:50 AM	#2 (permalink)
Highland Runner Registered User Join Date: Jul 2002 Location: Highlands, NC Posts: 682	I had this type of problem and I'll tell you what it was. A mouse had made a nest in the fan unit. The fluff and stuff was inside the fan and little pieces were sticking through hitting the sides as it turned. I also had a Tacoma where leaves had made their way into the fan from the cowl. The twigs stuck through the fan making a clicking sound as it turned. This problem was intermittent until I fixed them. I guess the pieces sticking through broke off untill another piece stuck through. Some what of a pain to get the stuff out of mine. I could only somewhat see the fan. Used a vacuum with a little tube and a piece of coat hanger to pull the stuff out. Eventually the fan on full speed will blow the rest out. __________________ Chris Mine-94 SR5 4-Runner, 3.0, 4X4, Aisin Hubs, Yakima Load Warrior, 210k Miles \| Wifes-99 Limited

01-02-2004, 05:24 PM	#4 (permalink)
MTL_4runner Contributing Member Join Date: Jul 2003 Location: Montreal, QC Canada Posts: 8,805	Bob, I'm afraid you will need to pull the blower motor but it will be obvious what is making the noise right away. It will also give you a chance to clean out the duct system as it is surprising how much dust and dirt gets in there. __________________ - Jamie 1996 4Runner SR5 4X4 Auto Deckplate Mod, Hayden Tranny Cooler, Amsoil Air Filter, OME 881/906 N86C/N91SC Lift Best OBD II scan tool I have used!. .....and I am AMERICAN!

01-02-2004, 05:33 PM	#5 (permalink)
Robinhood150 Contributing Member Join Date: May 2002 Location: Wandering around Phoenix Posts: 6,043	Maybe you should send in the cat! __________________ Steve. '93 4Runner V6 Auto 4x4 Robinhood's Lair. \|\| Gettin' Off 4wd Club member Lots for sale:5.29 ARB IFS third member... Click Sierra Club policy: [A reason to close trails] ...Physical soil damage, often readily visible, resulting in: a. Erosion, causing soil loss and damage to stream banks, streams, and fish habitat... Lesson...Stay on the TRAIL!

01-02-2004, 05:36 PM	#7 (permalink)
Robinhood150 Contributing Member Join Date: May 2002 Location: Wandering around Phoenix Posts: 6,043	Oh I'll fit the cat in there. __________________ Steve. '93 4Runner V6 Auto 4x4 Robinhood's Lair. \|\| Gettin' Off 4wd Club member Lots for sale:5.29 ARB IFS third member... Click Sierra Club policy: [A reason to close trails] ...Physical soil damage, often readily visible, resulting in: a. Erosion, causing soil loss and damage to stream banks, streams, and fish habitat... Lesson...Stay on the TRAIL!

01-03-2004, 06:00 AM	#9 (permalink)
Highland Runner Registered User Join Date: Jul 2002 Location: Highlands, NC Posts: 682	I forgot to tell you guys how I knew it was a mouse in the car. My brother and I got in to go to the store and he turns the heat on. As so as he did a piece of mouse ear comes out of the vent and lands on him. We didn't use the heat after that. The mouse was nowhere to be found when we took it apart though, just the nest. __________________ Chris Mine-94 SR5 4-Runner, 3.0, 4X4, Aisin Hubs, Yakima Load Warrior, 210k Miles \| Wifes-99 Limited

01-02-2004, 04:26 PM	#3 (permalink)
Bob_98SR5 Contributing Member Join Date: May 2002 Location: Los Angeles Posts: 10,090	eeeek! a mouse! i'll have my wife do it. one of the other odd things that i noticed today too is that when i try to move the lever to the left (recirc), it is much harder than before. there is some resistance. i'm going to have to take this apart. well, i'm used to it so no big deal but i hope that its not one of those little plastic gears. you konw they won't sell such a little part and so you'll have to buy the whole million dollar unit. bob

01-02-2004, 06:03 PM	#8 (permalink)
Bob_98SR5 Contributing Member Join Date: May 2002 Location: Los Angeles Posts: 10,090	MTL, Thanks, I'm going to check out my FSM tonight. Patty was totally against the cat going in there and inspecting. Though a little catnip might persuade him. Bob

01-25-2004, 08:07 AM	#10 (permalink)
Bob_98SR5 Contributing Member Join Date: May 2002 Location: Los Angeles Posts: 10,090	Guys, I finally got off my lazy butt and inspected the fan as MTL suggested. Sure enough, he was right. All it was were some small leaves and a twig. Here's some pics: Twig and leaves: And yes Jamie, the thing was filthy! I took the time to take a scrub brush to it with some mild, soapy water. I was amazed at how much dirt was in between the fan blades and the HVAC ducts: Here it is, all clean: To remove the fan unit, you'll need to remove the glovebox. Al lthat takes is a screwdriver and a 10mm socket. you'll also need a #25 torx bit, a flexible drill shaft (an invaluable tool---you should run out and buy one of these asap), and of course, a powered drill. There are 3 bits underneat that need to be removed. Once it falls out, you need to unclip a black harness. of course, write up coming soon. Thanks guys. And no, no little mouse was found. Edit: writeup here at http://www.4runners.org/articles/fan Bob Last edited by Bob_98SR5; 01-25-2004 at 08:50 AM.

01-25-2004, 10:20 AM	#11 (permalink)
MTL_4runner Contributing Member Join Date: Jul 2003 Location: Montreal, QC Canada Posts: 8,805	No prob man.....thanks for doing the writeup! __________________ - Jamie 1996 4Runner SR5 4X4 Auto Deckplate Mod, Hayden Tranny Cooler, Amsoil Air Filter, OME 881/906 N86C/N91SC Lift Best OBD II scan tool I have used!. .....and I am AMERICAN!

01-25-2004, 10:26 AM	#12 (permalink)
Fink Super Moderator Staff Join Date: Jul 2003 Location: Orlando, FL Posts: 7,431	Will this technique also work pretty much the same for the 2nd gens? I have this same problem and was about to post something on it but then I found this thread...if it will work for a 2nd Gen then I'll be doin' this shortly. Fink __________________ 2007 Tacoma DC TRD Sport YotaTech Store

01-25-2004, 12:26 PM	#13 (permalink)
MTL_4runner Contributing Member Join Date: Jul 2003 Location: Montreal, QC Canada Posts: 8,805	I would bet it is very similar but the fan assembly may be quite different. Look in a Haynes manual to see what your duct system looks like and how to remove the blower motor. If that is not the problem, it will at least give you a chance to clean out the fan and the ductwork. __________________ - Jamie 1996 4Runner SR5 4X4 Auto Deckplate Mod, Hayden Tranny Cooler, Amsoil Air Filter, OME 881/906 N86C/N91SC Lift Best OBD II scan tool I have used!. .....and I am AMERICAN! Last edited by MTL_4runner; 01-25-2004 at 01:52 PM.

01-25-2004, 01:51 PM	#14 (permalink)
Fink Super Moderator Staff Join Date: Jul 2003 Location: Orlando, FL Posts: 7,431	Alright...thanks for the advice MTL! Fink __________________ 2007 Tacoma DC TRD Sport YotaTech Store

01-25-2004, 04:17 PM	#15 (permalink)
2001Millrunner Registered User Join Date: May 2003 Location: Lynnwood, WA Posts: 1,182	my heater makes ticking noise as well, i'll take it out and inspect it as well. thanks guys, i was wondering what that was. and it was getting very annoying __________________ 01 4runner 4x4 SE (stupid Cntr lock diff,VSC,TRAC) Stuff I've wasted my money on front/rear chicken fence clear corners Hella 500s Lexus HID PIAA LED bulbs ISR, Breather,DP Mod Amsoil filter husky cargo liner Cobra STX II SE badge Griot's stuff Alpine CDA-9815+Infinity Reference+12"Fosgate Punch/amp BFG A/T 32s Bilstein HD *Perforated Leather Seats...Buncha other stupid things "Uh....I dont know what I'm doing" -Ray http://community.webshots.com/user/ray0227

01-26-2004, 03:08 AM	#16 (permalink)
MTL_4runner Contributing Member Join Date: Jul 2003 Location: Montreal, QC Canada Posts: 8,805	Any of you guys having any heating problems too? Mine is not as hot now in the dead of winter. __________________ - Jamie 1996 4Runner SR5 4X4 Auto Deckplate Mod, Hayden Tranny Cooler, Amsoil Air Filter, OME 881/906 N86C/N91SC Lift Best OBD II scan tool I have used!. .....and I am AMERICAN! Last edited by MTL_4runner; 03-01-2005 at 05:10 AM.

01-26-2004, 03:39 AM	#17 (permalink)
Mossback74 Contributing Member Join Date: Jan 2003 Location: Hillsboro, OR Posts: 908	Heater not hot anymore? tell it to go on a diet and hit the gym well, lets see, check coolant level full? Is thermo stuck open? no? Is heater core clogged? (long shot) no? Am I out of ideas? YES __________________ 4Runner Anthracite 98 LTD 3.4 AT 205K miles, 285 Pro Comp X-Treme MT , Blue Taco Shocks and TRD tundra coils, Diff Drop, N86 and 891 w/ cones, 1.5" Body Lift, E-Locker w/anytime mod, 4 in. Deckplate, Amsoil air filter and fluids, Optima 34R, Yak Rack and Hull Raiser. (Wrecked 94 is still missed)-----See the pics-----

01-26-2004, 04:42 AM	#19 (permalink)
TDiddy Contributing Member Join Date: Sep 2002 Location: Urbandale, IA Posts: 7,113	Great work Inspector Gadget! I've noticed that ticking on occasion too, and after seeing pics of that dirt, I'm gonna have to tear in to mine as well. Nice job with the write up!

01-31-2004, 06:10 AM	#20 (permalink)
MTL_4runner Contributing Member Join Date: Jul 2003 Location: Montreal, QC Canada Posts: 8,805	Well I finally pulled out my blower motor and it was really not too bad as far as being dirty although when I put the clean one back in and turned it on full a whole bunch of dust blew out of the vents so there must be some increase in airflow to do that. The blower was definately making some faint squeaking noise before and it is almost silent now so mission accomplished. My experience was a bit different than Bob's because the screws holding the unit up to the ducts were 8mm instead of 10mm and to get it out I needed to remove the doorjam molding and the passenger side kickpanel (both very easy to do). After undoing the screws and the electrical connector, the unit just drops right down. The other big revelation is that you can service the blower motor bearings too. The black plastic housing can be separated from the motor by undoing the 2 screws on the bottom of the motor as you can see in this pic here: Then once those are out, you need to pry off the access cover. This is a little shield that is also on the back side of the motor (it just pops off with a screwdriver). Then you need to use a screwdriver to pry the motor out of the housing using the access hole for leverage. The motor should just slide out but it is a tight fit so take your time and don't apply too much pressure or you can crack the housing. Took me a little time but it came right out. Then when it is apart, you have access to the brushes (check them for wear) and oil the bushings. I used electric motor oil but marvel mystery oil or 3 in 1 oil will work fine too. The rear bushing has a pad for absorbing the oil so be sure to soak it thoroughly. The front bushing requires more disassembly to get at it (you need to remove the squirrel cage first). I did not go any further since it it is winter and we are screwed up here if I damage it, so I left it alone. I will disassemble it more this summer. Another thing is that it is ok to fully submerge the blower assembly (including the motor) in soapy water or a cleaning solution (make sure to rinse with water after) as long as you let it dry thoroughly after. The motor runs on DC so technically it can even operate underwater.....no need to fear getting water in there, but again make sure to dry it out before install just to prevent rusting. You can also spay the inside of the motor with a little WD40 for some extra insurance against this. It was definately worth doing so I hope this helps others. __________________ - Jamie 1996 4Runner SR5 4X4 Auto Deckplate Mod, Hayden Tranny Cooler, Amsoil Air Filter, OME 881/906 N86C/N91SC Lift Best OBD II scan tool I have used!. .....and I am AMERICAN! Last edited by MTL_4runner; 01-31-2004 at 08:18 AM.

01-31-2004, 07:39 AM	#21 (permalink)
cabbage Contributing Member Join Date: May 2003 Location: Santa Maria, CA Posts: 621	I hear a sound once a while too, there's something I can do today! Thanks guys! __________________ Milton 01 Tacoma access cab 4x4 TRD TC Long travel, Supercharged 04 Tacoma Doublecab 4x4 TRD hoes all around!

03-06-2004, 08:35 AM	#22 (permalink)
keisur Contributing Member Join Date: Jan 2003 Location: Houston, TX Posts: 5,376	Bob You should Rev your write-up. This is how I did it this morning. Just pull the clip and pull the squirl cage. then clean the cage and I did one extra thing. take your air compressor and blow the dust out of the motor. man, when I hit it with air the first time a cloud of brownish black dust billowed out of it and continued for a good 15-20 seconds. then just reassemble and reinstall. man, I would post thumbnails but this new system really sucks. I can't figure out how to do that the old [] type formatting doesn't work anymore. anyway, here's the pics. __________________ Front: 4.88's w/ ARB Locker Rear: 4.88's w/ ARB Locker Lift: Suspension - F: Sway-A-Way Coilovers; R: OME Coils/Shocks Body - 2" HDPE Pucks w/ higher strength bolts Recovery: TJM T15 Bull Bumper w/ Warn M8000 Winch Lighting: Lightforce Striker 170's Multimedia: Kenwood DNX5120 DVD/GPS/USB/iPod/SAT Sound: Focal 165A1 Component Front w/ Focal 130CA1 Rear Infiniti Kappa Perfect 10.1 Sub 500W RMS amp for fronts and rears; 500W RMS amp for sub Power: Optima Blue Top 1400 Watt Power Inverter Last edited by keisur; 03-06-2004 at 08:39 AM.

03-06-2004, 09:19 AM	#23 (permalink)
MTL_4runner Contributing Member Join Date: Jul 2003 Location: Montreal, QC Canada Posts: 8,805	Hey keisur, Any tricks to getting the rotor off? I tried and failed....but I didn't want to break it either (at least in the middle of winter!) Let's hear the technique!!! What did you use to clean off the blower cage? It looks spotless!! __________________ - Jamie 1996 4Runner SR5 4X4 Auto Deckplate Mod, Hayden Tranny Cooler, Amsoil Air Filter, OME 881/906 N86C/N91SC Lift Best OBD II scan tool I have used!. .....and I am AMERICAN!

06-05-2004, 11:46 AM	#25 (permalink)
Inspired Registered User Join Date: Oct 2003 Location: Montana Posts: 1	Speaking of mice, who do you think is responsible for this?! I bought my 4Runner used last fall, and the air output was never up to par, and it rattled a bit when I turned it on high. A few days ago, it got so bad that no air was coming out the vents and the dash was vibrating like mad. Thanks to all your posts and Bob's awesome write-up, I took the plunge and pulled out the fan, expecting to see twigs and leaves... -Jennifer Last edited by Inspired; 06-05-2004 at 11:48 AM.

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