Question about 2004 Chevrolet Avalanche
Is the cooling system full of coolant ? Do you have manual or automatic HVAC ? Possible water pump problem !
Posted on Apr 27, 2015
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Posted on Jan 02, 2017
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Oct 14, 2012 | 2004 Chevrolet Avalanche
Try stopping on a steep incline--does the heater stay warm? If yes, what you have is an air bubble that hangs at the heater hose until pressure from the water pump blows thru it as the engine speeds up. Park on an incline, open the radiator cap, run the engine until the thermostat is open, turn the heater on, crack open any/all bleed ports to release any trapped air, and fill the radiator to the neck. Wait until the level stops dropping and make sure bubbles don't continue to come up. If they do, you may have a blown head gasket that will keep forming these bubbles until you change the gasket.
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