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GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I am ***** ***** My 2004 Blazer heater stopped working

Customer Question

Customer: Hi, I am ***** ***** My 2004 Blazer heater stopped working
JA: Thanks. Can you give me any more details about your issue?
Customer: fan just blows cold air
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Submitted: 1 year ago.
Category: Chevy
Expert:  Mike S. replied 1 year ago.

First confirm that the radiator is full of coolant and both heater hoses going into the heater get hot when the engine is warm.

Customer: replied 1 year ago.
Coolant is a little low, but both hoses are about the same warmth
Expert:  Mike S. replied 1 year ago.

Is the engine warm and thermostat open? Is there actually a thermostat in there? Did the heat ever work before?

Customer: replied 1 year ago.
Last winter I flushed the system and the heater worked fine. The temperature is at normal according to the gauge
Customer: replied 1 year ago.
I guess I had better go buy some coolant and fill the radiator to the full line
Expert:  Mike S. replied 1 year ago.

How low is it? If it's only an inch or two, just use water, unless of course the coolant mixture is weak. Is it? Test it.

Customer: replied 1 year ago.
2.5 or 3 inches
I had better get some coolant, winter gets cold here
Customer: replied 1 year ago.
Thanks for now Mike
I will come back here if the problem is not solved.
Expert:  Mike S. replied 1 year ago.

ok

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