need help fixing a heating problem

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Nov 22, 2008 | 01:16 PM

ed sak

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need help fixing a heating problem

my 1999 silverado blows warm air on bi-level and cold air on defrost. i changed the thermostat did not solve the problem. i had great heat the day before. what could the problem be?

Nov 22, 2008 | 02:48 PM

Truckshop

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From: Prairieville,La

flush you cooling system. your heater core is half stopped up. if you have access to compressed air you can blow through also.

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