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AC not working

Tiny
NOTAPROMIKE
  • MEMBER
  • 2001 PONTIAC BONNEVILLE
Air Conditioning problem 6 cyl Front Wheel Drive Automatic 311000 miles

I was having trouble with my power door locks and push button trunk release and interior lights, so I was in the fuse box under the back seat checking things out. Ever since my AC compressor will not turn on. Help. I cannot find a fuse under the back seat marked AC. The problem with my power door locks/ interior lights/push button trunk release mysteriously disappeared after I got out of the 100 degree hellish Texas heat& back in Minnesota.

I checked this fuse and it is good. Swapped it out anyway. AC still not working. There is no power to the 2 prong hookup that connects to the compressor when I have the AC on. I think there should be. Any more suggestions? Thanks. Mike PS I also switched out the AC relay inside the fuse box under the hood. It was good also
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Monday, June 21st, 2010 AT 4:39 PM

12 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hello,

There is 4 fuses for the system to work, a compressor relay and a ac pressure switch that can do bad, here is a some wiring diagram and a guide to help you figure out whats going on.

Check for power at the pressure switch.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

also the compressor will not come on if the system is low.

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

Please run some tests and get back to us so we can continue helping you.

Cheers, Ken

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Thursday, May 4th, 2017 AT 7:33 PM
Tiny
WCRUDOLPH
  • MEMBER
  • 1 POST
  • 2001 PONTIAC BONNEVILLE
  • 152,000 MILES
The a/c was turned on and blew hot air from drivere side vents and cool air from passenger side vents
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Thursday, May 4th, 2017 AT 7:33 PM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Yes, this a common problem.
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Thursday, May 4th, 2017 AT 7:33 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You need to open it up and investigate-could be a door actuator/vacuum problem and also the HVAC control module-hard to say what's causing it-
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Thursday, May 4th, 2017 AT 7:33 PM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Do you have split control system for each side?
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Thursday, May 4th, 2017 AT 7:33 PM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Some people have reported just adding freon has fixed it.
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Thursday, May 4th, 2017 AT 7:33 PM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
The other most common fault for dual system is drivers side temp door actuator.
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Thursday, May 4th, 2017 AT 7:33 PM (Merged)
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Net says 90% success rate with adding freon.
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Thursday, May 4th, 2017 AT 7:33 PM (Merged)
Tiny
JAKESTER2261
  • MEMBER
  • 1 POST
  • 2001 PONTIAC BONNEVILLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 119,000 MILES
Air Conditioning problem
2001 Pontiac Bonneville 6 cyl Front Wheel Drive Automatic 119000 miles

I have a SSEi with the dual climate control where the drivers side only blows vent air but the passenger side works just fine. Thoughts?
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Thursday, May 4th, 2017 AT 7:33 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
The vent directions are run by vacuum. Chances are there is a damaged or disconnected vacuum hose under the dash. Check to see if you can find one. With the engine running, you may be able to hear a hissing sound.
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Thursday, May 4th, 2017 AT 7:34 PM (Merged)
Tiny
AIRMAN1949
  • MEMBER
  • 1 POST
  • 2001 PONTIAC BONNEVILLE
  • FWD
  • AUTOMATIC
2001 bonneville a/c appears to have proper freon pressure, but no cool air, only one side had been cooling in the cabin, now neither side. Any ideas
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Thursday, May 4th, 2017 AT 7:34 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Possibilities here could be the magnetic clutch, pressure switch, AC relay and also check the air blend door/actuator-HVAC control module
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Thursday, May 4th, 2017 AT 7:34 PM (Merged)

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