Question about 1999 Chevrolet Silverado 1500

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Heat only blows out briefly then changes to cold air

After letting the truck warm up properly i only get a burst of warm air then the air blows out cold--i had a new thermostat put in last fall--what could be the problem? Is their a heat sensor on this truck, if so, where is it?

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  • Anonymous Feb 07, 2009

    water coming out tail pipes

  • Mike Butler
    Mike Butler May 11, 2010

    Have you checked your coolant level ?

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  • 1,118 Answers

Heater core could be pluged up, try flushing it out, it could have sedament build up restricting flow into heater core. Also make sure its full of coolant.

Posted on Feb 06, 2009

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