2004 Chevrolet Avalanche Heating

2004 CHEVROLET AVALANCHE
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PAPA0215
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Coolant disappears, already changed water pump but still can't find leak. Also, when heat is on it blows cold air even when the reservoir is at the right level. How do i fix this?
Aug 23, 2015 at 4:56 PM
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WRENCHTECH
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The heater is blowing cold air because there is air in the system. You have all the classic symptoms of a blown head gasket.
Aug 23, 2015 at 5:34 PM