Question about 2003 Dodge Grand Caravan AWD
The part that controls the temperature of the air coming out the dash vents is called the blend door and the blend door actuator motor, this door is operated by a small specialized electric motor that moves this door back and forth between the heater core and the AC core to give the desired temperature of air at the vents. The common issue here is that this plastic door warps and begins to stick, this destroys the tiny motor drive that operates due to overloading. To repair the problem requires the entire dash be removed from the van, a huge job, the door is located inside the air ducting under the dash.
Posted on Feb 13, 2012
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Posted on Jan 02, 2017
the most probabale cause of this would be a disfunctional hear core if you replace your heater your heater will more than likley work the the way it's supposed to
Posted on Jan 18, 2009
SOURCE: heater wont get hot
it has a valve on the heater hoses on one hose that has a vacuum line running to it check both sides of the hose on each side of the valve if its hot both sides its ok. Then check to see if both hoses are hot this will mean that the water is flowing ok if its not reverse the hoses on the heater core somehow it will flush the core out. If this is all working then its the door on you heater box not closing the air conditioning hole off . It goes through the same vents as heater
Posted on Dec 16, 2008
Have you checked the coolant level? What you describe is exactly what happens if the coolant level is low. When stopped at idle, hot coolant is not circulating through the heater core, so no heat. As the engine increases in rpm's when you pull away from the light, the water pump is spinning quicker, and some coolant is making it to the heater core. So check the level, and if it is low, keep an eye on it to see if it drops again. That of course indicates a leak somewhere. Get it fixed, as overheating the engine leads to costly repairs and worse case a new engine. Let me know how you make out with this.
Posted on Dec 05, 2009
Testimonial: "Thanks Curt! You were right ON!"
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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