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[Cornbinder89]

I wouldn't be happy with those temps either. Not sure where I would go from here. I am also at a loss to explain why less the 6 oz less than before would...

[Cornbinder89]

Ok, I pulled up the vehicle on Rockauto to see what kind and how many pressure controls the vehicle has. If it can be believed it has THREE! a low pressure...

[Cornbinder89]

If it has two wires the coil is isolated from the compressor and needs a ground wire....

[Cornbinder89]

If you power on one of the feeds to the clutch, I'm thinking you should have a good ground on the other. Not to say they couldn't switch the ground side...

[Cornbinder89]

The type of chart you posted really don't have much meaning. They are approximations of what you MIGHT expect to see. The chart I posted is what the phase...

[Cornbinder89]

chart is here:
https://forum.aircondition.com/forum...pressure-chart

I'd feel better about the pressures if they were at 1500 not idle....

[Cornbinder89]

Yeah, it points to undercharge, but only if everything else in the system is working as it should. Another way to check is if you can get to both tubes...

[Cornbinder89]

If your up for a gamble, keep adding a little at a time until you reach 30 to 32 psi low side with the engine running 1000-1500 RPM. Keep and eye on...

[Cornbinder89]

Glad to be of help....

[Cornbinder89]

Looked on Rockauto to see what kind of switch it has, and there is no "Trans AM" list for 1999? Grand AM is but no Trans AM?
I guess a...

[Cornbinder89]

Ok, then post some pressures both at idle and at speed (2000 RPM) and we'll go from there. The fact that re-sets says more likely electrical than mec...

[Cornbinder89]

With a re start the problem goes away, sounds like a computer issue. Most new stuff has a micro controller to run the heat/ac system. Good luck!

[Cornbinder89]

"Age enhanced" reading strikes again!

[Cornbinder89]

I'd want to put in another 6 oz about 1/2 a can. Your low side at speed is a little low, but that 6 oz may bring it up.
whoop's I mis read that...

[Cornbinder89]

I tried to do my own without the ability to make hoses, and found it just isn't practical. If your going to do much A/C work a hose crimper is almost...

[Cornbinder89]

System (heat) capacity is determined by all the components, the amount the Tx valve can flow and the surface area of the evaporator plus the above mentioned...

[Cornbinder89]

It is why I'm loath to "throw parts" at a problem, although sometimes that is all that's left to try. If you have 20x 30" of free space...

[Cornbinder89]

Well, if the head pressure is still too high, than yes you do need to shed more heat, even if a "new factory condenser" is there. For what ever...

[Cornbinder89]

Don't worry I check the forums once a day at least, when I can.

[Cornbinder89]

I would test for power at the clutch wire when the A/C is "on". 1st. If there is power do Tom's test with a stick to see if the clutch will...