WellI have time to work on this thing some more.ThePCM has been replaced. The out come is about the same. No a\c in drive when stopped. Afterthe car is going thea\c will work.

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2004 Black GXP 157,00 Mi.
1988 corvette coupe 5.7 auto 133,000 Mi.
1984 Corvette coupe 5.7 auto 248,00 Mi.
1999 SUPPERDUTY 7.3 auto 4X4 ( GM retrieval truck )328,250 Mi.

so now it works in drive unless the car is stopped. With the car in drive, the parking brake on, and the hood open, is the AC compressor clutch cycling?

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bobgto65

2004 Bonneville GXP 62,000 miles purchased 04/13
2009 G8 GXP PBM, M6 9580 miles, no mods, sold 08/15
2009 G8 GT SBM 36,000 miles, modded 430 whp
2002 Bonneville SSEi 203,200 miles (sold 3/2014)

NO, you dont need to open the hood . you can hear the clutch drop out, THE A/C OFF light comes on on the hvac control panel. After the car is moving the a/c off light will go out and cold air will come out of the vents. I would think that the system is charged correctly since it does work when in netural with the reved to about 1500-2000 rpm. In a earlier post someone suggested checking the TPS this checks out fine.

Any one have any ideas ????????????

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2004 Black GXP 157,00 Mi.
1988 corvette coupe 5.7 auto 133,000 Mi.
1984 Corvette coupe 5.7 auto 248,00 Mi.
1999 SUPPERDUTY 7.3 auto 4X4 ( GM retrieval truck )328,250 Mi.

When driving, shift into neutral and let the engine idle, does the A/C shut off?

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Ryan
Check out my detailing page on facebook! --> Next Level Detailing

2003 Bonneville SSEi - The Black Mirror SOLD!
2002 Bonneville SE - The Mutt Complete 2004 SLE interior, drivetrain, and body harness swap, ECC swap, HUD swap, black GXP wheels, GXP headlights and tinted tails - SOLD
2003 BMW 540i M Sport, 2001 BMW X5 4.4i, 2010 GMC Acadia, 2017 Grand Design Imagine 3150BH
1982 Cutlass Supreme - The fun one

No works ok, same when you come to a stop at a light .

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2004 Black GXP 157,00 Mi.
1988 corvette coupe 5.7 auto 133,000 Mi.
1984 Corvette coupe 5.7 auto 248,00 Mi.
1999 SUPPERDUTY 7.3 auto 4X4 ( GM retrieval truck )328,250 Mi.

Sorry,I ment It works ok at the stop light when the car is in netural.

_________________
2004 Black GXP 157,00 Mi.
1988 corvette coupe 5.7 auto 133,000 Mi.
1984 Corvette coupe 5.7 auto 248,00 Mi.
1999 SUPPERDUTY 7.3 auto 4X4 ( GM retrieval truck )328,250 Mi.

Maybe check the wire harness connector to the A/C refrigerant pressure switch under the hood for damaged wires or a bad connector and the pressure switch may be going bad so try replacing it.

_________________
bobgto65

2004 Bonneville GXP 62,000 miles purchased 04/13
2009 G8 GXP PBM, M6 9580 miles, no mods, sold 08/15
2009 G8 GT SBM 36,000 miles, modded 430 whp
2002 Bonneville SSEi 203,200 miles (sold 3/2014)

Wow, what an unusual HVAC problem.
Thought that the PCM reset should have worked too.

Personally think it's an electrical/electronic fault. Have you checked the push buttons and or controls associated with HVAC system? Potentially a poor wiring connection showing itself only under certain conditions i.e. connections shift under forward and reverse motion.

Basically grasping at straws hear...

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Praim


Midnight Blue 2005 Bonneville GXP - 182,500 km, all engine oil seals replaced, upgraded to Energy Suspension polyurethane sway bar and end link bushings, Volant CAI, 4300K HID headlights, Continental DW Extreme Contact tires

[size=85]1982 White Toyota Celica GTS - lots and lots of mods on this classic and lots of track time. Excellent condition.

Well I finally went and it the bullet and took the car to an independent shop. First was a bad front left trans mount. While looking at the scan tool a A/C low pressure fault was found . All the problems were from a broken wire at the pressure switch. This was caused from the broken mount letting the wire harness being pulled to tight and breaking the ground wire (?) . repairing the wire fixed the problem. Thanks to all that contributed. Brett

_________________
2004 Black GXP 157,00 Mi.
1988 corvette coupe 5.7 auto 133,000 Mi.
1984 Corvette coupe 5.7 auto 248,00 Mi.
1999 SUPPERDUTY 7.3 auto 4X4 ( GM retrieval truck )328,250 Mi.

Hmmm glad you fixed it, sounds a lot like my suggestion in my last post,

_________________
bobgto65

2004 Bonneville GXP 62,000 miles purchased 04/13
2009 G8 GXP PBM, M6 9580 miles, no mods, sold 08/15
2009 G8 GT SBM 36,000 miles, modded 430 whp
2002 Bonneville SSEi 203,200 miles (sold 3/2014)