Question about Toyota Pickup

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My 91 toyota pickup keeps overheating in hot enviroments. When the weather is cool the truck runs fine when it's hot it runs hot and overheats when I have the AC turned on. I've had to turn off the AC and turn the heaters on just to get the engine to cool down. I have replaced the thermostat with a fail safe one but that did not seems to affect the cooling at all. Any suggestions?

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  • chargerinaz Jun 30, 2009

    Thanks,
    Question about the overflow jug, it was at a very low level and I filled it to the full level could this also be the problem?

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The fan, is it electric? If so, this is your problem. It is failing....this is common with electric fans. If not, then it is the water pump. In hot weather, running the A/C causes a lot of vehicles to overheat.

The major causes of overheating are:

1. Low fluid level

2. Sticking thermostat

3. Clogged radiator (requires flushing)

4. Failing water pump

5. Failing electric fan motor (starts to weaken and not allow enough airflow through radiator)

6. POSSIBLY the air filter

I hope this helps! Except for the fan, it is a cheap fix for all the above.

Posted on Jul 01, 2009

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Hi,

Oxidation due to extreme high temperature is one of the biggest enemies of engine oil life. Fortunately you were using Mobil 1 when the vehicle overheated. Your oil sensor is probably programmed to indicate an oil change is needed if a certain engine temperature is exceeded, which likely occurred when it overheated. You saved an engine but to be on the safe side we would consider changing the oil just in case the oil was partially degraded. You may want to also check your coolant level frequently for the next few months to make sure you have not caused a coolant system failure as well.

I had a problem with my thermostat, and it was sticking so the overflow jug wouldnt **** back into the radiator. I replaced the thermostat, which is like a $4 part and about a 10 minuite fix. Try doing this first, if this doesnt help, then maybe go to a radiator shop and have them pressure test the system to make sure the system holds pressure and isnt leaking. Thanks

Posted on Jun 30, 2009

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Posted on Jan 02, 2017

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Overheating especially on steep grades. Runs pretty hot most of the time when it used to have needle on gauge in center. replaced Thermostat with no change at all, also did cleaner flush and replaced...


try taking out the thermostat and running without it, also take lose all the cooling system hoes es and running straight water through it to clean out your cooling system.

Nov 11, 2012 | 1984 Toyota Pickup Deluxe

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I have a 91 V6 4Runner that was overheating. I put a new radiator in since it had a crack in it. Car ran great for 2 days then today overheated once again. no signs of leaks anywhere. Could it be the


For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
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1 Answer

1989 toyota 4runner overheating


For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

---------------------------

Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
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1 Answer

1990 toyota pickup is running hot and when i shut


Try with the small stuff first. Replace the thermostat. Before you do that, you should flush and refill your system with just water after the flush process. The bottle of solution that you put into your radiator to flush it and clean it has instructions, follow those. Then let the car cool down and drain the system and refill it with fresh water only. Run this water for a bit and then do it once more. Once cooled back down , replace thermostat and replace the 50/50 mix of antifreeze and water.
Check engine oil level as well, low oil will overheat engines quickly.
NEVER REMOVE THE RADIATOR CAP ON A HOT ENGINE. !
NEVER REMOVE THE RADIATOR CAP ON A HOT ENGINE. !!
NEVER REMOVE THE RADIATOR CAP ON A HOT ENGINE. !!!

Aug 06, 2011 | 1990 Toyota Pickup

2 Answers

Bought this car in January, everything was fine. now that the weather is hot, seems the fuel overheats and the car dies. Left to cool down, will run till it gets hot again.


Only way to really know is to test thing but the things that can do this are the fuel pump or relay. The crank sensor, the ignion module, the coil.

This is providing the coolant is not overheating. If the coolant is overheating then as the motor gets hotter,,less fuel will be added creating a possible stall. When an engine is shut off they usually get a little hotter by the sensors before they start to cool down.

Jun 26, 2010 | 1992 Plymouth Acclaim

3 Answers

It is overheating in 32 degree weather.....I have checked to see if my radiator is gettign enough anti freeze and it's fine but i dont know why it keeps overheating


The engine overheat is due to inefficient cooling. Therefore, there is coolant in the radiator but if it doesn't circulate inside the engine water-jacket to remove the heat generated from combustion's chambers, then it still causes overheat. If this keeps happening then it can cause the engine head wrapped then leaking from the gasket as people called blowed head gasket. It could be: 1- Thermostat is not opened. 2- Water pump is not working. Before starting to replace parts, it needs to verify it it is the root cause of the problem. Take out the thermostat and run the engine to feel if there is water flowing inside the upper hose. A- If it is not then water pump is not working. B- If is, then run the car a few days without thermostat to see if it causes overheated. C- Running car without thermostat still causes overheat then there are some clogging up in the water jacket defeating the cooling efficiency--> Need a good flush. Good luck.

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3 Answers

Overheating


If the cooling fans, water pump, radiator, and thermostat are all working properly and the engine is still overheating, I would take a look at something a little more simple, like a defective radiator cap. Try this inexpensive fix and see if it works. Sure hope this helps and good luck.

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1 Answer

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original issue sounded like thermostat but now that you have lost power i would have to say thermostat, blown head gasket, and warped head

to check thermostat find and remove place in pot of boiling water the see if it opens, then to ice water to check if closes.


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