77 air conditioning trouble
Thread Starter
Cruising
Joined: Sep 2012
Posts: 14
Likes: 1
77 air conditioning trouble
I need some help with my a/c in my 77. Just did a frame off restore. For the A/c everything is new (compressor, dryer, liquid metal line, evaporator, compressor hoses, orifice tube), and the condenser is original. i took it to an a/c man today and they charged it (and it held) at 90% of 3# of freon 134a that was put into it. It is not blowing cold in the car. It is cool but not cold at all. I adjusted the hot/cold divider door and that helped a little. Trying to figure out why it isn't cold like it should be. Any thoughts anyone?
Le Mans Master
Joined: Dec 2007
Posts: 6,422
Likes: 591
From: McHenry Illinois
There are several possibilities. What are the pressures? Try pinching one of the heater hoses to stop the flow and see if the temps drop. Do you have a thermometer in the vent, what is that temp and what is the outside temp? Did the shop vacuum it before charging?
Thread Starter
Cruising
Joined: Sep 2012
Posts: 14
Likes: 1
It was 90 out today. They told me the high side was 250# and the low side was 30#. I don't have a thermometer in the vent. I'll check that. I'll ask the shop about vacuuming it out.
Racer
Joined: May 2007
Posts: 370
Likes: 0
From: Cherry Hill N.J.
I believe they put too much 134 A in the system.........
The actual amount of 134 A should be between 75 to 80 percent of the original R12..
Evacuate some of the 134 and see if cooling improves.....
The actual amount of 134 A should be between 75 to 80 percent of the original R12..
Evacuate some of the 134 and see if cooling improves.....
