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  #1  
Old 12-08-2007
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Wont heat up

My truck doesnt heat up. The temp guage will get just a little above the C and it stops there, even in the summer. Last night I was out running around for 4 hours with very little stops and the interior never warmed up either.

Think I should start with the thermostat or could there be another problem. The previous owner had the radiator replaced in Jan 05.
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Old 12-08-2007
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There are only two possibilities.

1) T-stat is stuck open or missing.

2) You heater core is plugged up (or not hooked up) **and** your temp guage is bad.

#2 is very unlikely..
I'm 99% sure #1 is the culpret.


Rich
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Old 12-08-2007
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After its been running for about 30 mins or so turn off the engine and feel along the upper and lower Rad hoses, the Rad top and bottom, and heater core hoses. If there all about the same temp (warm but not hot) to touch then I would suspect the thermostat is stuck open or missing.
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Old 12-11-2007
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if not the thermostat.then what?sorry to steal the thread.i have a 89 with 4cyl.put new thermostat.and it still won't heat up.sounds about like his.you can grab the radiator hoses after driving it.
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Old 12-15-2007
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I just went thru the same thing you can try and purge the lines make sure you have full radiator fluid then start it up hold it 2500rpms for 90 secs.

If that doesnt work its probably a stuck thermostat i had to buy one for my truck it was $128 i couldnt believe it. I put that baby in and now she blows REALLY REALLY hot air and my gauge works also. I see yours is a 96 hopefully they are cheaper.
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  #6  
Old 12-16-2007
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I am having the same issue with my 96 right now. it has a brand new thermostat in it. There has to be some other possibility as to why its not working lol.

did you replace your thermostat yet? did that fix the problem?
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  #7  
Old 12-16-2007
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i have replaced my thermostat.and it didn't help.gets warm with cardboard in front of radiator but not hot enough.
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  #8  
Old 12-17-2007
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If you put the correct temp thermostat in and the problem remains, I'd have the system flushed.
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  #9  
Old 12-17-2007
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I have gotten bad thermostats. The whole batch at the store may be bad. Buy one at another store and see if that fixes it.

Be sure the thermostat is the right temp for your engine and the wax motor has to be opposite the radiator hose, that is, pointing to the block.

Are you sure you installed it correctly???

A stoped up radiator would cause the engine to run hot.
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  #10  
Old 12-17-2007
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If its not the thermostat is gotta be the heater core.
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