Question about 2000 Dodge Ram 1500 Truck

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AC Vacuum Leak

When accelerating cold air turns into hot air, usually when this happens I can decellerate and have cold air once again, when this happens I always hear a damper door close, help

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  • desertladi Aug 04, 2008

    Thanks greasynail1, I will check this out

  • ruthgeana Aug 16, 2008

    When I hit my brakes, my cold air turns into hot air. But when I turn the A/C off, then back on, it's fine until I have to stop again?????

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  • 183 Answers

The temp blend door is operated by a vacuum motor.At higher engine rpms the manifold vacuum decreases.Most manufactures incorporate a vacuum storage tank to compensate for this lose of vacuum.So it does sound like you have a vacuum leak to the ac control unit.There should be a vacuum line going through the firewall into the cab.Inspect this line for leaks.Good Luck!!!!

Posted on Aug 04, 2008

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What could be the problem in 89 Lincoln town car if ac blow hot air when accelerating but when ideling or less then 46 mph blows cold?


I'm no expert when it comes to your vehicle. However it sounds to me as though there may be a vacuum leak somewhere causing the HVAC door that controls the AC/heat to be faulting to the 'hot' side.

Drive the car up to 55 MPH with the AC on. Making sure there is no vehicles close behind you,completely let off the gas pedal and see if it starts blowing cold air right after letting off the throttle. If it blows cold, then it's probably a vacuum leak.

If it doesn't blow cold then it could simply be low on freon or a partially clogged filter in the AC line.

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Hello.
This is happening because your vacuum reservoir is not working.
The vacuum reservoir maintains vacuum to your AC controls as your engine vacuum drops during acceleration.
Check all your vacuum lines and the reservoir for cracks and you will have this situation solved.
The reservoir was a metal can (like a tomato juice can) at one time but if my memory serves me in 1986 they went to a plastic version.

Take care and thank you for using FixYa.

KL

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