Question about 1997 Chevrolet Blazer

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Heat in '97 blazer working only when accelerating

Until recent the heat in my Blazer was at least working. It wouldn't start working once I turned on the car but eventually it would warm up and all was good. I don't think the A/C has worked since I purchased this vehicle (5 years ago) and when I took it to the dealer they said something was leaking in front of the dash and it would cost $800 to repair and get my A/C working again.

So this past Sunday my heat finally stopped working altogether. This morning I took my car in and had the thermostat replaced and the radiator flushed. When they brought my car out it was warm inside (not hot). The minute I started driving it again the air was getting cool. I came to notice after driving around the city and on the highway that when accelerating the air gets warm but when I stop accelerating and stop at a light the air gets cool.

From my research a lot of people have posted that maybe the thermostat was stuck open but considering I just had it replaced today professionally, I doubt that is my problem here.

Any other ideas? Could there be a connection between the A/C not working and the heat not working? The most important thing right now is getting the heat working as I live near Cleveland, Ohio and it's cold as hell outside these days.

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One other thing to look at is the vaccum actuator on the heater box, under the dash on pass. side, verify its not leaking vaccum and holding the internal door open for heat. You can normally grab the actuator shaft and operate it by hand to see if this gives you heat... also verify that both hoses to the heater core are hot. hope this helps.

Posted on Dec 28, 2008

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