Heater on driver-side blows barely warm air other vents blow cold
2001 Dodge Grand Caravan 3.3L V6. After the engine is warm (the engine temp. needle is around the center of the gauge), with the heater & fan on full speed, only the driver-side vent blows barely-warm air weakly; but the rest of the vents blow cold air with full force... Any idea what's wrong?
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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.
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.
Its just a vent damper plate not operating, it's like a gate which controls the flow of air,,usually they are operated by vacuum, or cables. Service center time, unless you are handy with your own repairs.