4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Stalling when heat is on..

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Old 02-23-2009, 08:41 PM
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SubZero00GT
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Default Stalling when heat is on..

I know this topic is brought up a lot but the only time i have an idling problem or the car stalls is when i turn on the heat or defroster.. Any ideas..? IAC? MAF sensor?
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Old 02-23-2009, 09:21 PM
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99BlackPonyGT
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iac.... i used to be able to flip my ac on and off a few times really fast and stall my car lol...cleaned the IAC and it went away
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Old 02-23-2009, 09:25 PM
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livefast1
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sounds like a vacuum leak at a heater door actuator.
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