Question about 2002 Chevrolet Blazer

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Inside heater temp

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.

Ron

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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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That sounds like a plugged heater core or heater hoses. At lower RPM there is not as much pressure from the water pump, so the coolant can't circulate through the heater core. Find the heater hoses (in and out) on the firewall. With the car running, engine warm to hot, squeeze the hoses - they should be hot and pretty tight. If they aren't, then something's probably blocking them. Then you'd just have to figure out if if it's the heater core that's blocked or the hoses. You can disconnect the hoses and blow compressed air in to the heater core. Probably a lot of crud buildup. It's messy but it can be done.

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I think you could be right about there being air trapped in the system.
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Although,i have seen it done by jacking the vehicle up high enough that the radiator was now higher than the heater core level, and then the coolant was put in.
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