Question about 1994 Chevrolet Suburban

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Heating system Replaced Thermostat , coolant , but still the heater only blows cold air. Could it be a plugged heater core ? Is the temp. switch still vacuum operated or is it electrical? Short time to go before the cold weather and need heat ! Thanks

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  • tskaff Oct 15, 2008

    Tried running with cap off and didn't work. Thanks for the advice though.

    Maybe a vacuum leak ?

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Sonds like air in your pipes!!! run ya engine with the lid off your expansion tank and put your heater on low until water starts bubbling and may start going down in your expansion tank and if so keep topn up to max mark!!!

Posted on Oct 15, 2008

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