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AC and engine slow down

Tiny
FAKLUN1
  • MEMBER
  • 2004 FORD TAURUS
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
When I turn on the AC the engine rpm's drops. At idle the drop can be as much as 400 rpm's. Any idea whats happening?
Wednesday, November 1st, 2017 AT 1:51 PM

5 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
It is very normal for the AC to add additional load on the engine, but the IAC normally compensates for it. You should try first cleaning the inside of the throttle body and backside of the throttle plate, then remove the IAC and clean and lube the slide valve inside. That should stabilize the idle.
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Wednesday, November 1st, 2017 AT 3:52 PM
Tiny
FAKLUN1
  • MEMBER
  • 2 POSTS
What is IAC?
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Wednesday, November 1st, 2017 AT 4:05 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Idle Air Control

This picture may be from a different model, but it is basically the same.
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Wednesday, November 1st, 2017 AT 4:10 PM
Tiny
FAKLUN1
  • MEMBER
  • 2 POSTS
Where on the engine do you normally find it?
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Wednesday, November 1st, 2017 AT 4:16 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
It will be in the manifold, near the throttle plate.
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Wednesday, November 1st, 2017 AT 4:24 PM

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