Notices
86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

AC idle up help

Old 07-06-2018, 10:40 PM
  #21  
Registered User
Thread Starter
 
Join Date: Apr 2015
Posts: 135
Thanks: 0
Thanked 0 Times in 0 Posts
Originally Posted by mholme View Post
Iím tempted to go out and drop my glovebox now that Iím curious what mine connects to, but in the mean time have a look here:

http://www.teamtoyota4x4.org/archivi...ci/aircond.pdf
my pickup is a 94 22re manual. I have a buddy that has a 90 22re 4x4 manual. We pulled his glove box and he doesnít have that plug.
an1176 is offline  
Old 07-07-2018, 04:58 PM
  #22  
Registered User
Thread Starter
 
Join Date: Apr 2015
Posts: 135
Thanks: 0
Thanked 0 Times in 0 Posts
Originally Posted by Dseldown View Post
No thats not strange at all!!....because he eliminated the ECU to see if the clutch would engage!!....If the clutch is good, it'll engage immediately upon jumpering it!!...as long as the compressor is pumping freon, the sysytem will start to cool if the rest of the system is healthy as normal!!...But its not a repair!!.... as you would risk the head building too high a head pressure and blowing the seal on the compressor or worst!!.... Ive done this before [jumpering the compressor clutch] for short periods of time to purge air outta of a system, when we didn't have a vacuum pump to do it correctly!!.... and took a field repair chance!!...meaning NOT TOO LONG, to avoid burning up the compressor, to try and get a system to charge and go for awhile or just 1 more summer on something that we didn't care about that much about...meaning low value cars or trucks!!
donít get me wrong, i love my pickup itís like my third child. Iíve pretty much rebuilt everything on this truck. AC Iím not to sharp on. Iím about to the point of just running the ac and seeing how long itíll last this way. Once it goes out Iíll replace everything. By the way from my understanding these trucks didnít come from factory with AC. They were a dealer option so finding ac parts that work could be hard. I had that issue with an expansion valve when i first got the truck going.
an1176 is offline  
Old 07-08-2018, 10:32 AM
  #23  
Registered User
 
Dseldown's Avatar
 
Join Date: Sep 2007
Location: Hilliard, FL
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Talking

Originally Posted by an1176 View Post

Iíve researched my butt off and i can not find a high pressure switch. The low pressure switch is inside the evaporator box. To get to it Iíll have to let all the Freon out and pull the box. I was hoping not to do that but i was prepared to. Funny thing is last week everything worked fine except the idle up, which i fixed yesterday. I added an electric cooling fan, doing away with the fan clutch on the water pump. Soon as i did that the ac started acting up. It would ingage and disingage, until finally nothing. Jumping the plug that i put a picture of ingaged the compressor again. I drove it today and it worked fine and ac blew cold and engine idled up. The electric fan has to be connected to the ac somewhere so that soon as your ac is turned on the fan comes on no matter what your coolant temp is. Iím wondering by doing this i didnít screw something up. The fan is jumped at the ac fuse currently. Thanks for the help.
Ahhh I wouldn't worry about it unless the conditions I mention after this are present!!... and don't tear into the evaporator assembly, Ive never understood why all car manufacturers, never design a evaporator enclosure housing that retains water tight sealing, that can be taken apart from the inside cab to be able to get to the evaporator enough to service it, example = cleaning the fins etc or freeing a clogged sweat/condensation evac port, short of replacement!!.... but anyway pay attention to whether the compressor clutch cycles at all!!...When you are blowing the coldest such as idling in the shade, just watch it with the hood up, and check to see if it cycles normal....if it NEVER CYCLES AT ALL, and the clutch never disengages, then you can "TECHNICALLY" build up TOO MUCH HIGH SIDE PRESSURE!!... and blow the head gasket on the compressor or a high side hose ETC, if the pressures get too high, thats the reason its supposed to cycle when needed to keep the high side within range and stop freezing up the EVAPORATOR!!.....I don't own a 4runner, but Ill take a WAG and say that the fan connector thats supposed to either keep air flowing for the radiator which is now used for blowing air threw the condenser, that when its on sends a signal to the ECU, that theres air flow "FAN ON" for the condenser and sends either VDC or ground to engage the compressor clutch!!....Glad you've got the clutch to engage, but AGAIN pay attention to the cycling, if the head pressure does get too high, the HSide pressure switch is suppose to signal the ECU to disengage the Comp clutch until the pressure drops enough for the high side switch to go back to a closed condition, so theres your failsafe if its working properly!!....Normal readings for a healthy auto A/C system is low at about 35psi Normal for high is about 200psi + the ambient temperature in F.....a HS cutoff pressure switch is generally set at around 320PSI then goes into an OPEN POSITION, until pressures drop then back to a closed position, completing the circuit once again...!!!....GOOD luck keep us advised as to how your yotas a/c system is behaving with this UNUSUAL fix effect!!
Dseldown is offline  
Old 07-13-2018, 11:47 AM
  #24  
Registered User
 
Join Date: Sep 2007
Location: San Francisco East Bay
Posts: 6,490
Thanks: 0
Thanked 62 Times in 59 Posts
Originally Posted by an1176 View Post

The plug with the green wire going into it. I put the green wire in because i added an electric fan. By the way with the electric fan my mpg went up 2.5 mpg. That plug has never been plugged into anything. Jumping it the ac started working again or compressor started working.
That connector appears to go to the A/C Cutoff relay. http://web.archive.org/web/201102052.../2aircondi.pdf (I don't see the relay; it is round, with a rubberized cover). It's only used on 4wd automatics. it's possible that all cooling units have the connector, but it is re-wired to "eliminate" it for non-4wd and manuals. OR an1176 somehow has a cooling unit (but not the relay) from a different vehicle. There would be four wires: L-R, R-G, B-Y, and I don't know the color of the fourth. The B-Y is switched 12v, so if the "fan" wire connects to the B-Y that could explain what is going on.

IF an1176 has a 4wd-automatic cooling unit, missing the relay, then it would only work if the switched lines were shorted together. ("jumped")
scope103 is offline  
Old 07-17-2018, 10:33 PM
  #25  
Registered User
Thread Starter
 
Join Date: Apr 2015
Posts: 135
Thanks: 0
Thanked 0 Times in 0 Posts
Originally Posted by scope103 View Post
That connector appears to go to the A/C Cutoff relay. http://web.archive.org/web/201102052.../2aircondi.pdf (I don't see the relay; it is round, with a rubberized cover). It's only used on 4wd automatics. it's possible that all cooling units have the connector, but it is re-wired to "eliminate" it for non-4wd and manuals. OR an1176 somehow has a cooling unit (but not the relay) from a different vehicle. There would be four wires: L-R, R-G, B-Y, and I don't know the color of the fourth. The B-Y is switched 12v, so if the "fan" wire connects to the B-Y that could explain what is going on.

IF an1176 has a 4wd-automatic cooling unit, missing the relay, then it would only work if the switched lines were shorted together. ("jumped")
my pickup is a manual tranny. Iíll have to look at the colors of the wires. My AC has always worked, not great but worked. The idle hasnít which Iíve resolved that issue. For some reason now the compressor wonít kick in unless that plug is jumped. Itís currently working fine.

Off the subject if anyone has plans on adding an electric fan to replace the fan clutch, a flexalite fan is a pain in the a**. Iíve had nothing but issues since Iíve added that fan.
an1176 is offline  
Old 01-02-2019, 12:34 PM
  #26  
Registered User
 
Join Date: Apr 2017
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Originally Posted by an1176 View Post

Update...
idle up issue fixed!!! Finally something is going my way. Lol. It was the idle up bypass valve that has the idle screw. I found only one used one on eBay and none new.

Compressor not coming on. I checked fuses again and i tried jumping the pressure switch nothing. Behind the glove box i have one plug that has never been plugged into anything. No idea what itís for. When you press the ac button it gets power. I jumped it and BAM compressor kicked on. Itís probab not what Iím supposed to do but i left jumped and i have cold air again.
There is a rubber diaphragm in that actuator that gets hard and cracks. Once it does, your idle will not idle up when the compressor kicks on and your engine idle drags down to the point that your car wants to shut off. Lucky that you found a used one as the part is discontinued 88606-35020. I replaced mine with used part from ebay and it fixed for a year until the used part went out. I am working on a fix that involves grinding the edge of the diaphragm housing carefully to separate the bottom plate of the diaphragm, buy similar part that is still available, do the same to new part just to remove rubber diaphragm. there is a spring in there too. I think I can reseal the two parts with silicone and small screws or bolts and nuts. Will see. I have some pics.
twotwore is offline  
Old 01-02-2019, 02:18 PM
  #27  
Registered User
 
Melrose 4r's Avatar
 
Join Date: Jun 2017
Location: Melrose MA. Right near Boston.
Posts: 788
Thanked 18 Times in 18 Posts
Originally Posted by twotwore View Post
There is a rubber diaphragm in that actuator that gets hard and cracks. Once it does, your idle will not idle up when the compressor kicks on and your engine idle drags down to the point that your car wants to shut off. Lucky that you found a used one as the part is discontinued 88606-35020. I replaced mine with used part from ebay and it fixed for a year until the used part went out. I am working on a fix that involves grinding the edge of the diaphragm housing carefully to separate the bottom plate of the diaphragm, buy similar part that is still available, do the same to new part just to remove rubber diaphragm. there is a spring in there too. I think I can reseal the two parts with silicone and small screws or bolts and nuts. Will see. I have some pics.
if you find the right material to use for a diaphragm this should work. I did the same operation on a Datsun 210 vac advance can once.if you can open it without grinding the edge, bending instead, it will be easier to put back together by recrimping.
Melrose 4r is offline  
Old 01-02-2019, 03:10 PM
  #28  
Registered User
 
Join Date: Apr 2017
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
I thought at first prying apart too and I tried. Its steel and I just could not get anything under the flange with proper leverage. Did not want to bend any vacuum ports either. I was working on my original part. The ebay replacement part was on the truck (2wd '94 extracab dlx 22re, 166k, original owner). The original part lasted to about 160k. Once I got it apart by grinding the light bulb went off and it was easy to figure out how it all worked. The part in the picture is the same as mine. That is for 22re with both power steering and a/c. The bottom part with the small L-shaped vacuum port is sealed by the diaphragm. The a/c compressor comes on, the a/c VSV gets voltage and vacuum is applied to diaphragm. The vacuum pulls the diaphragm down and unseals a port inside that allows air from another line connected in front of throttle body to bypass the actuator and go directly to plenum. The idle goes up. I ordered two parts for Camry (88606891022, DIAPHRAGM SUB-ASSY, COOLER). Different part and wont fit on truck but I think the diaphragm is the same which is the only thing I care about and the fact that it appears to still be available. There must be loads of people with the same issue out there that can't fix this issue and its a big issue for truck with a/c. I have scoured the internet for the exact part for my truck and no luck. Maybe available from overseas but not dealing with those sellers. Sketchy. Waiting on the Camry part. Will let all know if this works out. I will do one and if it works I will do the other as backup. I will try to post pics for all.
twotwore is offline  
Old 01-04-2019, 11:09 PM
  #29  
Registered User
 
BlackPearl808's Avatar
 
Join Date: Jan 2016
Location: Big Island, Hawai'i
Posts: 89
Thanks: 0
Thanked 0 Times in 0 Posts
Outstanding work, gentlemen.
BlackPearl808 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
KODE
86-95 Trucks & 4Runners
8
06-30-2010 05:29 PM
taikowaza
86-95 Trucks & 4Runners
2
05-25-2006 06:58 AM
Forerunner
95.5-2004 Tacomas & 96-2002 4Runners
4
10-10-2004 08:03 PM
Yoter
95.5-2004 Tacomas & 96-2002 4Runners
1
08-13-2004 05:11 PM
mike_d
95.5-2004 Tacomas & 96-2002 4Runners
11
11-14-2003 06:50 AM


Thread Tools
Search this Thread
Quick Reply: AC idle up help


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: