Question about PIAA 2008 Chevy Uplander - All Uplander models - Xtreme White Bulbs

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Why does my heat only work when I accelerate? When I slow down it cools,no heat blows.

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The coolant level might be low/

Posted on Nov 21, 2014

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Posted on Jan 02, 2017

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Driving a good distance car makes a whamming sound the more Itry to accelerate the speed decreases whinning louder only stops whinning when I pull over to let the car cool down


Have your wheel bearings checked, when a wheel bearing is going bad it hums louder as you accelerate, when you stop or slow down the sound stops. A bad bearing does that, it over heats due to it not having enough grease on the bearing and will hum as you drive and get louder as you accelerate.

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2006 dodge grand caravan heater only blows warm air when i am accelerating


With the engine cold check the coolant level. Add as necessary. If the coolant gets low enough the first thing to stop working is the heat. Accelerating will push coolant into the void and provide heat until you slow down and then the coolant drains back into the motor.

If you have lost enough coolant to loose heat there is a leak. Some common areas are the rear heater lines under the passenger side of the van, the water pump, and the radiator.

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My a/c will cool while i am going down the road but when i stop or slow down it blows hot air....i am not sure if this has anything to do with that but during the winter my heater did the same thing it...


check out first the fan for your AC under the hood close to the radiator. There should be one for the radiator and another for the condenser of the AC. It could either, the fan is not blowing or it has become weak. Check out the wiring if it may have caused it to not work.

If all check out OK, have your AC system checked out if you need more freon or of there are leaks. HAve the condesner checked out as it may not be cooling effectively.

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Check for a vacuum leak. WHERE is the magic question.

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I think you might want to start with thermostat replacement and pressure flush the system and as other suggestion check levels when car is COLD!!!!!!

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Slow speed, fan coming on loudly in Dell D800


Yeah the slowdown is the laptop throttling back due to overheating.

When you do processor-intensive work like - streaming videos - the laptop overheats. The fans come on loudly.

When the computer heats up despite the fans, the processor throttles back to relieve the heat.

When you reboot your machine, it stops performing intensive work, giving it a chance to cool down. It's not restarting that fixed the problem it's the fact that the laptop cooled down.


So here's what you do. Get an air duster and blow all the dust and gunk out from your fans. They are most likely clogged with dust and that's what's causing your cooling problems. If there are large dustballs in there, use a tweezers and pull them out. Get as much out as possible.

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