2002 Pontiac Ram Air Trans Am ac is not cooling properly

[Tim]

When it is not working well is when you need to get some pressure readings.

This would have been a good thread for GMtech. But have not seen him around in a while.

[dannyual320]

When it is not working well is when you need to get some pressure readings.

This would have been a good thread for GMtech. But have not seen him around in a while.

Tim, all of my gauge readings I've posted in this thread have been when "its not working well."

[Tim]

This is the last readings see posted. If charged properly charged, you might try a new CV. High is low and low is high. Personally I would not try a different color. What I see is you're not pulling down the low side very well. 34 psi is what one expects to see at idle, not 1500.

Cold engine

Idle.................................1500rpm
H135................................H155
L32..................................L34
Vent83F............................81F


Engine warming up but still not hot

Idle.................................1500rpm
H180................................H190
L34..................................L32
Vent78F............................78F

[dannyual320]

Thank you, Tim. It sounds like you and Al9 both recommend changing the purple control valve. Since I've got to open up the system anyway, another inexpensive item to replace is the OT. Would you recommend I do that as well or not?

[Tim]

Since it is open, sure.

[dannyual320]

Hey guys. I know it's been a long time since I've posted. I was out of town on vacation visiting family out east and when I got back, I started trying to learn how to MIG weld. Anyway, our north Houston mornings have been cool but our afternoons are still in the mid to upper 80s so not having working ac is still a big issue!

I do have a new control valve and a new orifice tube. I looked at the compressor both from the top and from the bottom. I couldn't see any control valve. I've looked at pictures of the Delphi compressor and it doesn't appear that the control valve is on the rear of the compressor either. I'm assuming that the CV is on the engine block side of the compressor and I'm going to have to remove it completely from the car. Does that sound right?

Thanks, guys and I promise not to let over 3 weeks go by again without updating this thread.

[Al9]

Don't know how the compressor is mounted on this car, but V5/V7 comps are generally mounted so that the control valve's colored dot tip points towards the ground. With compressor's head, i meant the rear shell (casing is composed of 3 separate shells).

[dannyual320]

I crawled under the car yesterday and looked at the compressor from below. It was just the smooth metal body of the compressor. On the topside, it was the same. At this point I have to assume that I'm going to have to unbolt the compressor from the engine and look to see if the control valve is on the side of the compressor facing the engine.

[Tim]

The image in this link shows the location of the Control Valve.

https://ackits.net/product/14-20730nc/

[dannyual320]

The image in this link shows the location of the Control Valve.

https://ackits.net/product/14-20730nc/

Thank you, Tim!!! I haven't been able to see that "view" of my compressor so it must be facing the engine.

I thought I was going to have plenty of time to work on this but now it looks like I won't be able to spend any time on it until early next week. I'll let everyone know once I've replaced the two parts.