The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Air Conditioning R12 convert to 134a

tgh117 · 05-14-2009, 08:11 PM

It sounds to me like the level is too low. There is no way to really check the current level in your truck without hooking it up to an air conditioning machine and checking the high and low pressures while the system is running. I am in the process of putting my truck back together and will now have AC and was lucky enough that my neighbor had about 7 lbs of R12 he had laying around and didn't want anymore, otherwise I would have been in the same boat as you and doing a 134 conversion.

Sorry for the digression, I am thinking there is a slight leak in some one of the connections or o rings and it leaked some of the freon back out. If you want your air working, you are more then likely going to have to take it back to an air specialist, and ask them to use a sniffer to check for leaks.

Good luck

05-14-2009, 08:11 PM	#3
tgh117 Crazy Join Date: Apr 2005 Location: Emmaus, Pa Posts: 203	Re: Air Conditioning R12 convert to 134a - 1982, 350ci It sounds to me like the level is too low. There is no way to really check the current level in your truck without hooking it up to an air conditioning machine and checking the high and low pressures while the system is running. I am in the process of putting my truck back together and will now have AC and was lucky enough that my neighbor had about 7 lbs of R12 he had laying around and didn't want anymore, otherwise I would have been in the same boat as you and doing a 134 conversion. Sorry for the digression, I am thinking there is a slight leak in some one of the connections or o rings and it leaked some of the freon back out. If you want your air working, you are more then likely going to have to take it back to an air specialist, and ask them to use a sniffer to check for leaks. Good luck __________________ 77 SB Stepside in a bunch of pieces scattered around the garage.