Heater???

Brad · 02-09-2003, 01:11 PM

I know this is a stupid question, but what goes out when the heater is not real warm? Is it the heater or something else?? I'll have the temp on hot and it gets luke warm at best.

Stupid, I know but any help would be greatly appreciated.

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rchavis · 02-09-2003, 01:14 PM

Check you engine temp gage. If it's low then your thermostat is staying open and your engine is not reaching it's normal operating temperature. It could also be that the thermostat that is in there, is one that is too low, like 160. It should be at least 180 degrees.

PhxTRDRunner · 02-09-2003, 01:27 PM

If its not the thermostat, It's the heater core. Kind of like a radiator for heat....usually under passenger dash on most cars.

jx94148 · 02-09-2003, 02:04 PM

Low coolant level will cause this to. With the engine cool, open the radiator cap and fill if you cant see the coolant.

With engine hot, feel the heater hoses for temp. Cool hoses = low fluid.

I read somewhere that the heater core will go into a bypass mode when its blocked. Coolant will flow through through the hoses and make them warm still but not through the main part of the core. IIRC.

Duffdog · 02-09-2003, 06:42 PM

I had the same problem you did when i bought my tacoma
the heater wasnt really warm, but the thermostat indicated correct temperature right!

well-- just go to the dealer and get a new "heater control valve" under the hood attached to the firewall, these go bad and dont let any coolant into the heater core. I changed mine and it fixed everything.

good luck

Tim

1Runner · 02-09-2003, 07:46 PM

When a heater core goes bad (leaking) you will either have a wet spot on the pass. floor up high, near the kick panel.... or you get a greasy residue all over the inside of your windshield. (anti-freeze) I've had this happen. I also had the heater control valve go bad.... oddly enough, both of those probs happened on my Dodge Daytona. My 4Runner has an incredible heater. I can get it so warm inside, that my wife will turn the heat DOWN!

MTL_4runner · 02-02-2005, 07:27 PM

Wanted to bring this thread BTT for the current heating probs.

02-09-2003, 01:14 PM	#2 (permalink)
rchavis Registered User Join Date: Jul 2002 Location: Seattle, Washington Posts: 86	Check you engine temp gage. If it's low then your thermostat is staying open and your engine is not reaching it's normal operating temperature. It could also be that the thermostat that is in there, is one that is too low, like 160. It should be at least 180 degrees. __________________ Amsoil Dealer 92 SR5 V-6 Bilstein shocks and PP springs. Daystar bushings, Mag-light mod. K&N air filter. Amsoil. CB. Firestik antenna, Scanner. Magnaflow catback exhaust, Car-sound cat-convertor. Pro-fit holder. Steering stablizer. PIAA 1400 Fog lights. Sylvania Silverstars, PIAA bulbs in dome light and corners, Sears Die Hard Platinum. Silblade wipers. Flex-a-lite electric fan. Flamm Freeway Blaster Horn Kit. Last edited by rchavis; 02-09-2003 at 02:03 PM.

02-09-2003, 01:27 PM	#3 (permalink)
PhxTRDRunner Registered User Join Date: Nov 2002 Location: Phoenix, AZ Posts: 695	If its not the thermostat, It's the heater core. Kind of like a radiator for heat....usually under passenger dash on most cars. __________________ '00 4runner Sold '94 Supra 6spd tt '05 Tacoma Double Cab 4wd TRD Offroad

02-09-2003, 07:46 PM	#6 (permalink)
1Runner Registered User Join Date: Dec 2002 Location: currently at large Posts: 902	When a heater core goes bad (leaking) you will either have a wet spot on the pass. floor up high, near the kick panel.... or you get a greasy residue all over the inside of your windshield. (anti-freeze) I've had this happen. I also had the heater control valve go bad.... oddly enough, both of those probs happened on my Dodge Daytona. My 4Runner has an incredible heater. I can get it so warm inside, that my wife will turn the heat DOWN! __________________ 2002 Tacoma double cab. 4X4 TRD package, rear locker. Imperial Jade Mica. Stock, stock, stock. It will have to stay that way for a while. (sigh) Hey!! I got some husky liners!!!

02-02-2005, 07:27 PM	#7 (permalink)
MTL_4runner Contributing Member Join Date: Jul 2003 Location: Montreal, QC Canada Posts: 8,807	Wanted to bring this thread BTT for the current heating probs. __________________ - 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!

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02-09-2003, 02:04 PM	#4 (permalink)
jx94148 Banned Join Date: May 2002 Location: Colorado Springs Posts: 2,617	Low coolant level will cause this to. With the engine cool, open the radiator cap and fill if you cant see the coolant. With engine hot, feel the heater hoses for temp. Cool hoses = low fluid. I read somewhere that the heater core will go into a bypass mode when its blocked. Coolant will flow through through the hoses and make them warm still but not through the main part of the core. IIRC.

02-09-2003, 06:42 PM	#5 (permalink)
Duffdog Registered User Join Date: Oct 2002 Location: CA Posts: 316	I had the same problem you did when i bought my tacoma the heater wasnt really warm, but the thermostat indicated correct temperature right! well-- just go to the dealer and get a new "heater control valve" under the hood attached to the firewall, these go bad and dont let any coolant into the heater core. I changed mine and it fixed everything. good luck Tim

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