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Old 02-26-2012, 02:38 PM   #1
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Car idling funny?

When I turn the defrost on my 99 mustang gt, the idle is pulsating. What could cause that?
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Old 02-26-2012, 02:43 PM   #2
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I know your air conditioner pump cycles off and on when you turn on the defroster. It helps to dry the air out .
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Old 02-26-2012, 03:27 PM   #3
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How about when you turn the A/C on?
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Old 02-26-2012, 08:03 PM   #4
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Only when I turn it to the right, which is floor, multi vent and defrost, I replaced ac compressor a few years ago and had recharged last summer, now it is not blowing cold at all and used to damn near blow ice? But really noticed it was pulsating when idling on defrost this winter also you can feel it going down the highway

---------- Post added at 08:03 PM ---------- Previous post was at 07:22 PM ----------

Just checked it and yes it does do it on ac
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Old 02-26-2012, 08:25 PM   #5
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Sounds like your compressor may be going south. What I am about to say is not neccessarily the gospel...

The lubrication in the compressor is carried through the system by the refridgerant. If somehow you sprung a leak in the AC system where that oil pools up or the seals in the compressor went and leaked that oil, you could wind up with a lack of lubrication issue and voila, a compressor that is hard to turn to the point where your car idles funny just because of the strain.
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Old 02-26-2012, 08:54 PM   #6
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Quote:
Originally Posted by AgentOrange
Sounds like your compressor may be going south. What I am about to say is not neccessarily the gospel...

The lubrication in the compressor is carried through the system by the refridgerant. If somehow you sprung a leak in the AC system where that oil pools up or the seals in the compressor went and leaked that oil, you could wind up with a lack of lubrication issue and voila, a compressor that is hard to turn to the point where your car idles funny just because of the strain.
Thanks for the info man!
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Old 02-26-2012, 09:05 PM   #7
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You'll know that your compressor is locking up if the belt starts slipping instead of turning it.
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