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This is caused by a blown gasket that allows coolant to escape. Does your engine smoke sometimes when theirs coolant? If yes, then it's definitely a blown gasket.
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∙ 12y ago
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Why does 2000 Chevy blazer with climate control blow cold air then hot air then cold air again?
Sounds like a malfuntion in the heat blend door actuator call your local autozone for more info
Why does your Chevy blazer blow cold air out of AC vents when you go over 55?
check the temp guage if low change the thermostat
On a 1998 Chevy blazer what would cause the heater to blow cold air?
Check Antifreeze level..make sure there are no leaks under the vehicle.
My 2001 Chevy blazer will only blow cold air what can you do to trouble shoot what repair must be made?
My 2001 Chevy Blazer was blowing cold air when I had the heat on. My husband flushed the line to the heater core and a bunch of junk came out and now my heat works great. My 2001 Chevy Blazer was blowing cold air when I had the heat on. My husband flushed the line to the heater core and a bunch of junk came out and now my heat works great.
Why would a heater on a 2001 Chevy Blazer blow cold air if the thermostat was just replaced?
The heater valve could be failing to open for one reason or another.
Why would a 2001 Chevy Blazer heater only blow cold air?
Low coolant in the system. Defective heater control valve. Clogged heater core.
On a 1998 Chevy Blazer what would cause the heater to blow hot air then cold and occasionally back to hot?
Either a faulty thermostat or you have a low coolant level.
Why would the ac on the drivers side of a 2000 Chevy venture blow hot while the left and rear ac blow cold?
The 2002 Chevy Venture has a dual a/c system. The 2000 might also. There could be a hole in the hose that goes to the left and back of the van, but not in the one that is for the driver's side of the van.
What might be the problem of cold starting in 1997 Chevy blazer?
Engine coolant sensor may be bad
Chevy blazer how many cold cranking amps should your battery have?
I would recommend 500 minimum.
Why the heater blow cold air on 96 blazer?
the heater core was stopped up just flushed it out ok now
On your 2001 Chevy blazer it takes 10 minutes driving before the defrost or heater blows hot air then when slowing down it starts to blow cold air and when taking off again it blows hot Any suggestion?
thermostat is stuck open.
