Question about 2004 Chevrolet Silverado 1500 Crew Cab

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2004 Chevy Silverado Heater blows cool air

My heater will heat for a minute but then goes back to blowing cooler air. Initially I checked my radiator fluid level and had to fill it up. The level of fluid has remained constant since then, but I'm getting mostly cold air coming from the heater.

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  • Anonymous Mar 21, 2014

    When heat is on,blows out cool air

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Check blend door actuator for operation

Posted on Feb 15, 2009

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The heater core is clogged mine is doing the same thing to make sure that is what it is run your truck for a while then check the hoses that come from you heater core if one of them is not hot then you have a clog if they are both hot listen to the other people

Posted on Oct 28, 2009

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Heater core is likely shot or going bad - I have a 2000 Silverado, Luv them Chevy's for 36 years!

Posted on Feb 15, 2009

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Hot heat at idle cool when driving


is there a chance that one of your heater hoses are clogged? or where they connect to the engine are clogged still? sounds like a clogged system. Cracked heater housing? Outside air bypassing the heater coil while driving?

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I have a 2001 silverado 5.3l 4x4. My heater blows warm air sometimes and then blows cold air. My thermostat stays at a steady 200 degrees when warmed up. I filled my coolant and didn't have any leaks, does...


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Check in the main radiator with the motor cool that the coolant is full as if the coolant is low there will be no heat in the heater. If it is low you need to check for leaks or head gasket problems. If its full check that the temp guage is coming up to its normal position as the thermostat could be faulty. Then make sure that the heater tap is operating corectly.

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2004 Chevy Silverado heater blows cold air. What would cause this problem?


the heat is independant from your ac. look for leaky radiator hoses or heater hoses,radiator cap,coolant

leaks inside your cab under the dashboard on your floor board. if you have non of these problems.

you may have a blocked or stopped up heater core and it will need to be replaced. depending on the

truck some replacements are easy and some hard , trucks and cars vary. good luck!

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Heater blows cool air instead of warm air


check your coolant level if it is low top it off. if it is full you may need to change your thermostat to get the temp back to normal. for the heat check the heater control valve to make sure it isn't stuck (heater control valve should be located against fire wall connected to heater hose.

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you have air trapped in the cooling system. A good indication is that one or both of your heater hoses going into the heater core are cold when they should be hot.
Park facing uphill, raise front of vehicle so radiator cap is higher than top of engine. (You want bubble to get to radiator and out the cap.)
Leave cap on but loose, so bubble can purge.
Turn heater on.
Fill radiator and reservoir with 50/50 mix of antifreeze.
Start engine and run at about 1500 roms until the engine warms up and thermostat opens.
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Shut off engine.
Fill radiator and reservoir. Install cap.

please Rate as fixya if this works. good luck

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Had the same problem with my Mazda6 awhile back. Took it to the dealer and they found the radiator wasn't holding pressure. They replaced the whole radiator under warranty (WHEW!). Not sure how to check for that kind of thing, but it's a start.

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1 Answer

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No your thermostat is stuck open which will not hurt the engine. but needs to be replaced, the thermostat is what allows the engine get up to operating temp. before allowing water to flow through the radiator and when it is stuck open it doesnt allow the engine to reach operating temp. so the heater never gets hot. I hope that helps you out.

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