2005 Pontiac Bonneville AC Cuts Off In Warm Weather

WALTHANKS

MEMBER
2005 PONTIAC BONNEVILLE
6 CYL
FWD
AUTOMATIC
98,000 MILES

For the past two weeks, my AC has stopped working whenever the ambient temperature goes above about 75 degrees. I can't even turn the fan on. But when it is cooler, the system works fine. Any ideas?

Saturday, May 15th, 2010 AT 1:43 PM

5 Replies

2CARPRO JACK

MECHANIC
11,533 POSTS

Just to clarify. Not even the blower fan works when it gets above 75? What about the heater? Will it work if you change temp to warm? Does the display still light up when it isnt working?

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Tuesday, May 18th, 2010 AT 3:31 PM

WALTHANKS

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3 POSTS

The display lights up but nothing works - not even the fan. Also, I have also noticed that, when the system is working, if I turn the engine off without turning the AC system off first, the system will not work the rest of the day.

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Tuesday, May 18th, 2010 AT 5:06 PM

2CARPRO JACK

MECHANIC
11,533 POSTS

Which Bonneville do you have? GXP, SE, SLE? So I can look up the correct wiring. And also is it automatic climate or manual control?

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Wednesday, May 19th, 2010 AT 7:58 AM

WALTHANKS

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3 POSTS

It is an SE with manual control. A new development - as of this am, it doesn't come on in cool weather either. Lights still come on, but nothing happens.

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Wednesday, May 19th, 2010 AT 8:47 AM

2CARPRO JACK

MECHANIC
11,533 POSTS

Problem being, since the controller lights up, but wont turn anything on it could be a bad connection at the plug, but the PCM also controls function through pressure switch feed-back. Have you had the climate control system scanned for trouble codes?Even the manual systems will store a code if there is a feed or controller issue.