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I have a 1996 windstar, and when I select heat or AC to my face/feet, or defrost, my engine ramps up to 4rpm's, but if I select the face or feet only my engine remains normal. What's the problem?

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  • Cars & Trucks Master
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Could be a problem with the idle air control valve, or something electrical.
When you command the defrost or ac on, the compressor is supposed to kick on along with the radiator fan. The computer bumps up the idle to recover from the extra load on the engine. If the compressor does not work, the extra RPM is not needed.
But the RPM should only go up about 2 or 300 above normal speed, even if the compressor is not working. So if it is going up to 4000 instead of say 1000 something is going on with the idle air control.

Posted on Apr 28, 2013

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Posted on Jan 02, 2017

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  • 2 Answers

SOURCE: '04 Jeep Grand Cherokee: Heats...but only through defrost vents.

Look for a vacuum leak to the heater contols,most likly a hose fell off at the intake manifold area.I bet the engine is running a little fast also.

Posted on Jan 16, 2009

  • 2976 Answers

SOURCE: no heat - ac stays on blowing through defrost vents

If you have the heater directed to the windshield, the AC will turn on. Move the control away from defrost.

Posted on Feb 01, 2009

  • 8 Answers

SOURCE: no air, ac, heat out of in dash face vent

I changed my switch..on my dash...that controls the different settings. All settings work fine now.

Posted on Feb 03, 2009

motor1258
  • 6674 Answers

SOURCE: Dodge Ram 1500...heater is blowing cold air, even

Take a flashlight and look up under dash from center console area, across to passenger side, for wiring harness, and/or hoses(small rubber) , they should lead you to it. Haven't had my head under one of those recently, and having a problem tracking you down a diagram for some reason, but it has to be there.

Posted on Feb 20, 2009

chuck943
  • 783 Answers

SOURCE: Vent control

You have a vacuum leak.Defrost is the default postion(no vacuum).
See if you can locate the small black vacuum line that goes inside the vehicle on the passenger side near the heater core. The trace it back,should see it going to a canister then to the intake manifold.Make sure it is not disconnected or broken somewhere.

Posted on Mar 02, 2009

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