Question about 2002 Dodge Grand Caravan
2002 Dodge Grand Caravan. The dash thermostat reads a regular operating temperature and remains constant. Over the past few weeks I have had cycling hot and cold coming from the vents when I use the heater and now have virtually no hot air coming from the vents at all. (The air, of course, is blowing fine.) However it does still sometimes blow hot briefly before returning to ambient air temperatures.
You may have air trapped in the lines to or from the heater core.
If you (still) have a real radiator cap on the radiator, remove it with a cold engine, start and run the engine allowing it to warm up while watching the water/coolant level. Make sure the heater control is set to its highest heat setting while doing this. If it is trapped air, you may see it 'belch' after the engine is warm and the engine thermostat is open. Refill as needed if this is the case.
It's more difficult without direct radiator access and may require several cycles of hot/cold to allow refilling through the overflow.
Posted on Dec 10, 2009
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Posted on Jan 02, 2017
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