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Blazer 98, no or very low heat


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rand13
New User

Oct 31, 2008, 7:48 AM

Post #1 of 2 (3105 views)
Blazer 98, no or very low heat Sign In

Hi. I got a

Year of vehicle 1997
Make of vehicle Chevrolet
Model of vehicle Blazer
Engine size
4.3l v6
Mileage/Kilometers 86.000

When I turn on the heater and leave the fan at the lowest speed (1) it will throw some hot air but if I speed up the fan, move the handle to 2 -3 or 4, as I move it up it will blow more air but it will start throwing it cooler, when it is at full speed it will only throw cold air.

I haven't tried anything yet, please advise

Thanks for your help

PD: The engine heats up to normal operating temp and it has enough coolant


(This post was edited by rand13 on Oct 31, 2008, 7:51 AM)


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 31, 2008, 8:08 AM

Post #2 of 2 (3102 views)
Re: Blazer 98, no or very low heat Sign In

That's classic for a plugging heater core. Chances are a good flush out would solve that. I suggest removing the hoses at the heater core (carefully - necks can break) install some temp hose and start with flushing backwards (larger hose if two sizes is outlet side) and continue back and forth then with the whole cooling system and it should be fine,

T







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