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Old 11-05-2009
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Truck keeps heating up.

Well its a 93 4.0 This weekend I just changed out the t-stat and did a radiator flush now the dang thing keeps heating up on me. With the old t-stat it over heated for a split second to about 3/4 of the way, with this new one I can drive it on the freeway with no problems but then when it comes to city driving it often want's to go above half if I don't keep it up to about 1,000 rpms. Tonight when I filled up at the gas station I fired it back up and the heat went right up to 3/4 way again but then quickly settled back down to under normal operating temp. What would be causing this? maybe the water pump isn't doing it's job like it's supposed to be? Any insight would be delightful.

Thanks R-F
Robert
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Old 11-05-2009
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air in the line? bad thermastat? thats my guess...
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Old 11-05-2009
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its all bled and you can tell when the t-stat opens when your driving on the freeway.
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Old 11-05-2009
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pull off one of the hoses going to your heater core, dont pull it off all the way, just crack it open and see if air comes out
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Old 11-05-2009
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Quote:
Originally Posted by Chevy_Guy View Post
pull off one of the hoses going to your heater core, dont pull it off all the way, just crack it open and see if air comes out
Don't know if it makes a difference or not but the truck blows out great heat. But ill try that tomorrow. Anymore ideas?
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Old 11-05-2009
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no, if it blows heat there isn't a bubble in the core so scratch that, is your radiator cap tight.
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Old 11-05-2009
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Cap's tight. The only thing I can think of is water pump, but there is no play in the fan what so ever. Im stumped.
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Old 11-05-2009
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yes then i would lean towards it being your water pump
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Old 11-05-2009
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Any specific way to tell if it is? Im kinda leaning that way as well being that when on freeway its find but in lower rpm's in the city from stop lights to stop lights it starts to heat up till i get er up in the rpm's again.
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Old 11-05-2009
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could be your fan clutch too, i just thought of that. did it heat up before you did the flush or did it start happening after. some water pumps leak slowly out the weephole, but some times its so slow its tuff to tell its leaking at all. did you pull the belt off and feel how smooth the pump turned by hand
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Old 11-05-2009
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It heated up on me last Friday night within 1 mile so over the weekend I did the t-stat and radiator flush. After that the cab of the truck finally started to get heat but engine temps still like to get on the warm side. I can't tell if its leaking at all but I have check the level over the past few days and keep adding a tiny bit of water each day, but no wet spots on the ground. I did not pull the belt off.
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Old 11-05-2009
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look behind and right below the pump on the block, I would pull the belt and see holw free the pump spins
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Old 11-05-2009
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Will do and thanks for the info Wyatt!
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