The A/C stopped working (and I live in the south :(( ). I'm getting a code 24 from the OBD I, telling me Vehicle Speed Sensor, MAT sensor, Vacuum Switching Valve, and ATS sensor could be the problems.

What the heck is a vacuum switching valve, and where is it? Would it cause my A/C to not work and the Service A/C light to come on? e-mail me... heyman1104@yahoo.com

I would guess that the Code and the AC trouble are unrelated. As far as I can see, the AC only shows up when the AC clutch circuit has a problem (Code 47).

It also seems that the cruise control is on that circuit, so if your cruise works and you're not getting a code 47 from your scan tool, then you're probably not going to diagnose it with your scanner.

I'd take it somewhere to see if it needs recharged.

Well the cruise does work, yet there is some freon in it. Would it keep the compressor from engaging if the freon was low, but not completely out?

.... Would it keep the compressor from engaging if the freon was low, but not completely out?

I believe it would. There's probably a pressure sensor on it that lets it know there is sufficient freon on hand to make running the compressor worthwhile.

That's the way it was on an old Ford I had, anyway. Not sure about the Rviera.

Good luck.

BTW -- I have been told that using do-it-yourself freon kits is a bad idea -- especially if they have some kind of stop-leak additive. Don't know from experience, but for the price, I would just go to a trusted mechanic and ask him to put some freon and dye in to "top it off."

I believe it would. There's probably a pressure sensor on it that lets it know there is sufficient freon on hand to make running the compressor worthwhile.

That's the way it was on an old Ford I had, anyway. Not sure about the Rviera.

Good luck.
I agree there is a low / and hi pressure switch on most A/C systems.A/C systems have dryer reciever?oraphice valve? condensor ,evaporator.some may have expansion valves and almost all have a thermastor or a temp stat is wat i call em. BACK TO THE QUOTE.
Yes to much or too little freon in A/C system can keep your clutch from engageing.. It would be better if you would have this checked out by a pro,, they may have to evacuate your system to see exactly how much was in it..
Also ya just might have em do the complete service on your A/C system
they should check diagnose replace wats needed and let you know whats needed to be replaced $$$.
What most people dont know is that the A/C system needs to be vaccumed down after any open work is done on it.eliminates moisture.
If this isnt done system failure can occure in so many ways.HOPE THIS HELPS