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Van revs up and down when the AC is on no check.

Tiny
ALFREDM8702
  • MEMBER
  • 2005 NISSAN QUEST
Van revs up and down when the ac is on no check engine light
Monday, November 26th, 2012 AT 7:06 PM

7 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
What is the idling speed when A/C is not turned on?
What is the fluctuating rpm when A/C is turned on?
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Tuesday, November 27th, 2012 AT 7:16 PM
Tiny
ALFREDM8702
  • MEMBER
  • 109 POSTS
Idle is at about 800rpm when ac is on 800 to about 1200
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Tuesday, November 27th, 2012 AT 7:27 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Check for vacuum leakages and clean the throttle body and retest.
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Wednesday, November 28th, 2012 AT 5:30 PM
Tiny
ALFREDM8702
  • MEMBER
  • 109 POSTS
Ill do that and get back to you
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Wednesday, November 28th, 2012 AT 7:09 PM
Tiny
ALFREDM8702
  • MEMBER
  • 109 POSTS
Ok I did what u said no leaks and throttle body is clean now it still does it
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Wednesday, November 28th, 2012 AT 9:18 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Test the charging system.
Clean the MAF.
What was used to clean the throttle body? Is your vehicle equipped with electrobic throttle control?
If basic procedures do not show anything, you would need to go into advanced diagnostics and thaht would mean plugging in a scan tool to monitor thr throttle control system components to see if any is out of specs.
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Thursday, November 29th, 2012 AT 2:31 PM
Tiny
DOMINICANO4U16
  • MEMBER
  • 3 POSTS
Hey I also had this same problem. Does your A/C stop working for a a couple of minutes then gets cold again? If so the problem is in the fuse box under the hood near the water reservoir tank. Crank your a/c and try to tap or do what I did which I banged it a little then waited to see if a/c compressor operate without turning off. Its why ur engine idle revs due to the a/c compressor turning off and on. There seems to be a bad relay. Or the relay connectors are bad. Or the box that hold the fuses and relay connector is loose or its gone bad on you. Try replacing these mentioned things and see what happens
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Saturday, September 14th, 2013 AT 7:27 AM

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