Question about 2001 Chevrolet Blazer

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Heater works sometimes. Blows warm then blows cold. could it be in the panel

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  • scooters Nov 14, 2010

    Thank you very much for your time and quick answer. This is my wife car and we live in cold country. The problem just seemed to be strange. Will check these things in the morning.

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Not likely. Check to see if you have coolant in the radiator and resevoir. If so...these cars have a notorious problem with plugged heater cores. The heater core allows coolant from your engine to cycle through what seems like a small radiator inside of your vehicle. Heat dissipates off of this/ or is blown off of it by your blower motor to give you heat. If you look at the two hoses that are located under your hood going into the firewall (or inside of the vehicle) put your hand on them when the car is warmed up. If one is cool....you more than likely have a restriction in your heater core. This is typically caused by oil mixing into the cooling system due to bad intake or head gasket....or, due to mixing coolants....like mixing the green stuff with the orange stuff (dexcool). Basically, you can blow out the core by removing the hoses, and applying compressed air through the system very slowely...not too much...cores are very delicated with very small orifices. Some people hook a hose up and let it work. If this works...hook hoses up and enjoy your heat. If it doesn't they sell chemical cleaners at part stores that will have to be poured into the core and let sit there for a few minutes....then hose it out. If one doesn't work...try the other. I obviously don't have the vehicle in front of me, but it is possible that you may have a bad thermostat too. But that usually will cause other issues....like erratic temperature guage on the dash

Posted on Nov 14, 2010

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SOURCE: Air conditioner blows alternate cold and warm air

check the freon level

Posted on Jul 16, 2009

emissionwiz
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SOURCE: heater blows cold air ac blows warm air

Your problem is the air temp control blend door actuator is defective and not controlling temp u set. to change/access this part the dash assembly must be removed from the car.

Posted on Mar 24, 2009

  • 141 Answers

SOURCE: heater on ford 2003 ford pick up blows cold air

on the evap box there is a control mtr that switches the hot cold door. these mtrs are prone to failure. the other problem that i have seen is that the door breakes in side the evap box and that means removing the box to replace the door . if i remeber correctly you may have to slide the dash back to gain assces to the control mtr to test it good luck

Posted on Dec 22, 2008

  • 583 Answers

SOURCE: ac blows warm air sometimes and then blows cold

first check gas level in the visigauge on top of the dryer canister

Posted on Aug 03, 2009

  • 66 Answers

SOURCE: The heater only blows hot air sometimes

it sounds like a bad blend door motor.these are controlled electrically and not with a cable like older vehicles did.

Posted on Oct 27, 2009

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