john c

Hello Guys
I am having problems with my heater it will only blow out luke warm air and never hot. I have put a new thermostat in today and still no difference at all. I have checked the cable from the heater and its working fine. The top hose from the rad is hot while the bottom hose is cold. ANY IDEAS. Will this problem with the heater and having a hot hose on the top and a cold hose on the bottom harm my engine at all.
John c
HDJ 80

Bad Coco

when you replaced your thermostat, did you use both gaskets, if not, water can bypass and will not heat up all the way. Also check that the valve off of the head to heater hose is all the way open.

yotaluver

you could do a coolant flush

hothead

Here is a Technical Service Bulletin (TSB) issued by Toyota I found

TSB: 029032787 22R-E Engine Temperature Overshoot
It says:
Some 1984 pickup trucks and 1983-1984 Celica models, equipped with 22R-E engines, may experience a condition called "temperature gauge overshoot". After starting a cold engine the temperature gauge will indicate a higher than normal engine temperature for a short time just prior to the thermostat opening. After the thermostat opens, the temperature gauge will return to the normal range. A new double valve thermostat has been made available to reduce temperature gauge overshoot.
And calls for part number 90916-03070 which according to the TSB replaces 90916-03055.
Not sure why they say this only affects 83-84 engines.

stonefly

john c...did you ever figure out the problem? I'm having the same thing with the landcruiser I just bought. I'm hoping it not a plugged heater coil.

Corbit

Stonefly I'm from Sebastopol , But I've got the same problem and would like to know what was the fix.

4Crawler

iTrader: (3)

One thing to check is the inside of the heater control valve, if that vehicle has one. In my old FJ55, there was minimal heat output and it turbs out the valve was almost totapply clogged inside. A new valve and it put out heat like no tomorrow. Also, while the system is open, shove a garden hose nozzle up the heater hoses and back and forward flush the heater core (both inlet and outlet lines open). You'll be surprised at the gunk that can get flushed out of there. And finally, be sure there are no air pockets in the system. If you hear a gurling or whooshing sound when you rev the ending with the heater valve open, there may be air trapped in the system. Bleed that out and get it totally full.

sprocket3

Hello,

I just purchased a Land Cruiser and I have the exact same problem you three do. The dealer flushed the cooling system and changed out the engine thermostat. No changes.

Did you ever get your heater fixed...

please email to: stewart1466@yahoo.com

miket223

I also have an '89 L/C that is having heating problems. I replaced the thermostat as well and it was the same. If I stop the fan from spinning then it has absolutely no problem warming up and subsequently blowing hot air. I can only guess that water is somehow still flowing through the radiator when the thermostat is closed and causing the vehicle to not reach operating temperature. I looked up a cooling system diagram after I did the repair and it does look like there are two gaskets, but when I disassembled I never saw a second gasket or any remannats so was never concerned and just replaced the main gasket and the t-stat. The diagram shows a second gasket that goes on top of the thermostat that might possibly be critical to sealing the thermostat properly. I think I will order this part from the dealer and R&R the t-stat again. This seems like a common complaint for the L/C, can anyone else chime in and set me straight? Either way, I will report back with the results later.

miket223

That missing gasket that lays on top of the thermostat was my problem. I installed a new one and the vehicle reached operating temperature easily and blows hot air from the heater.