Question about Equus 2008 Pontiac Montana Obd2 Can Code Reader For Vehicles Built After 199

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Heating system cools when sitting idle

Heater works fine but cools when speed drops and when stop for lights

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That's somewhat normal, it should cool a little, but if it cools alot it means that there is something blocking the water circulating from the engine to the heater core in the car. First check to see if the thermostat valve is opening and closing fully when you move the heater temperature on the dash back and forth. THere is a valve on one of the hoses that goes through the firewall into the heater core. Have someone move it back and forth while you watch the valve. Adjust as necessary. Next, check that you have the antifreeze/water mixture up to the top in the radiator and to the full line in the resevoir. Low fluid gives poor circulation to the heater core. Last, is the worst...a possible blockage in the heater lines...THat is a cleaning out the hoses problem...

Posted on Jan 02, 2013

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