Question about 2001 Chevrolet Silverado 1500

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My truck dosnt get hot in the cab blows warm cool air!

Temp for moter is good. blows good air. i flushed the heater coir already.

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  • mo5457 May 11, 2010

    Where is the heater control valve?



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  • 46 Answers

I would check your heater control valve, that, or the core itself being bad, are the two most common problems I've had with Chevys.

Posted on Dec 04, 2008


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Heater blowing warm and cool air

Try flushing the cooling system. The heater core us probably clogged. A flush may clean it out. Good luck.

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I have an 1994 ford escourt wagon LX...i have replaced the thermostat and housing and back flushed the whole system..the air still doesnt blow hot enough air to warm the car up inside..this needs to be...

Hi hope I can help.
Go in the engine compartment on the passenger side fire wall,
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run your engine up to temp
Then place your hand on the two hoses. (heater core hoses)
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Please leave feedback thank you FixYa

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No heat , replaced radiator , water pump, rad. cap , hoses and flushed system twice.blows cool air.whats left?

Thermostat.? if you haven't? Do it first then try it. While the car is running for a while touch the heater hoses that lead to the firewall. if one is cold and one is hot? You have a blocked Heater core. Follow the hoses back to the engine. Unconnect them both. By using a garden hose flush out the heater core do one side and then reverse by doing the other hose Lots of junk will come out so be care ful. Mistake people make is "Flushing the system" That doesn't mean your flushing the heater core.
Seeing that you have done everything else it could be the thermostat which you didn't list or the heater core being clogged. When you finished installing the thermostat and flushing the heater core out. Replenish the coolant system . If you have a bleeder on the thermostat housing? use it . loosen it and top off the fluid until you see fluid comeout of the bleeder. The system being air bound would cause no heat..

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Is this a quantity of air problem or quality of the heat from the heater?
If its heat from the heater you need to first flysh and reverse flush your cooling system, includes radiator etc and use a good flushing agent first. Then replace heater water valve.
Refill and bleed out cooling system and get car up to temp.
When hot, feel pipes going into and out of heater matrix. On full heat they should both be roughly same temp, if not , replace matrix cos it must have collapsed.
Have yoy EML light checked at local garage using spec diagnostic tools.

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I dont get hot air in the cab just warm!

I would check the air blend door to see if it is working right. It may not be closing all the way leting cold air in! Try touching the heater hoses, if both are about the same temp. I would check the air blend door.

Dec 04, 2008 | 2001 Chevrolet Silverado 1500

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