Question about 1991 Toyota Pickup

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Blowing cold air,and overheating

My 1991 toyota pickup is blowing cold air when I put the heat on, and overheating. What could the problem be?

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First thing i'd do is check & fill coolant as needed, then monitor level for possible leak. Make sure you run the engine when you add coolant, and make sure heater is on. Let it run for quite a while with cap off, to disperse air in system. When coolant level gets low, engine needs all it can get which will cause it to sort of by-pass the heater, until level gets back up where it should be. Low level explains reason for engine heating up as well as no heat inside. Hopefully the reason for the low level isn't anything too bad, or expensive, but you'll know soon enough if you monitor the coolant level faithfully, or if not sure, have your system pressure tested to avoid major problems in future, if nothing major yet.

Posted on Dec 12, 2008

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Also check your thermostat they tend to get stuck in these trucks

Posted on Dec 19, 2008


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Check and top up the coolant level. When an engine heats up fast and there is no heat from the heater it is low enough on coolant that it doesn't circulate through the heater core. Hope this helps.

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1991 Toyota Pickup 22RE overheats when the heater is turned on. Without heater on, heat gauge is normal; also no water in oil. Thermostat opens and heater is working.

Hello, sandlapperh and thank you for asking your question on Fixya!

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your
1991 Toyota Pickup, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people in your exact situation.
How to diagnose your overheating
1991 Toyota Pickup

Get more great money saving tips and tricks about your vehicle from:

Thanks for the vote, and good luck!

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I have 91 toyota pickup truck and the heater blows cold air i have replaced the thermostat and has plenty of antifreeze. please let me know if you have any suggestions

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During the warmer months, this valve is not being opened and closed, and it can get stuck. Moving the arm a few times will probably get it working again.

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did you take out the thermostat?
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