Question about 2002 Chevrolet Blazer
The inside heater temp is going up and down with the engine's rpm. At road speed temp is normal and at a stop sign cold air take over. There is a new thermostat, new fan belt and the engine temp is operating in the normal range no ups and down with its reading. How does the flow of hot coolant move through the heater core? is it with a vlave control through the front panel temp dial on the dash. or is there a vacuum hose some where involved.
Some where on the heater lines or by the heater core there should be a gate valve. However is your heater fan fluctuating ( blower motor ) with your R.P.M.s ? if so then check the tension on your altenator belt.
Posted on Oct 21, 2008
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Posted on Jan 02, 2017
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Apr 05, 2014 | 2006 Jeep Commander
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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