Question about 2001 Chevrolet S-10

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I have 2001 chevy s 10 you turn defroster on have no heat just cold air could the thermastate be bad. thank you

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Well, if the thermostat in the engine was bad, it might overheat not stay cold.

Sounds more like a vacuum tube problem with the climate control that controls the door that leads to the heater core.

Posted on Jul 04, 2010

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1 Answer

How come i dont get no heat?


The heater core may be plugged with rust. Good way to test it is with the engine warmed up put the controls in heat mode and then go under the hood and locate both water hoses going t the heater core. Hold on to both hoses to see if the temperature of both hoses are the same. If not, no water is getting into the core. . If the temp is the same, then control vacuum is not working. There is a check valve in the line to the control head that prevents vacuum fluctuations from moving the blend door when accelerating. Check it.

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I have no heat in my car was wondering if this could be a vacum hose problem


i just had almost same thing. i was getting heat then cold air. replace thermastate and bleed the air out of lline

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If the thermostat is not working the engine will not warm up. So the temp gauge should show cold after running the engine for 10 or 15 min.
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When heat or air is on, with the control switch turned to "floor" it still comes out defrost vents. does not come out from floor. 2001 chevy s-10 blazer. 2 wheel drive v-6. 4 door.


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1998 Chevy S10 pickup air condition compres is on instead of heat


First be sure that you do not have the controls set to defrost the windows since on just about all vehicles nowadays with the controls set that way the air conditioner will be turned on...even if it is not so warm outside. So...be sure that you do not have any of the controls set to defrost and that the heater is turned all the way on.

It sounds like though that the control for the vents is not operating properly. This is a combination of mechanical movements of the vent flaps and small "air motors" that operate the flaps. These air units are controlled by air vacuum taken from the engine compartment through tiny hoses. If the hoses get cracks, holes or come loose from their fittings then your vents will not move correctly so it is a matter of looking and tracing each one of the hoses to make sure they are fastened correctly, have not come loose and are not cracked or leaking. The problem can even be in the engine compartment where the hose(s) connect to the engine vacuum system...so it will take lots of looking carefully with flashlights etc....good luck.

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