mdbrass2

My son has recently purchased his first truck. I'm so excited he got a classic !! I am familiar with older cars and working on them. I have owned my share.

This is not my area... A/C. The man we bought it from had the engine rebuilt and the tranny about 4,000 miles ago. He said he was doing something and he loosened a bolt (showed me the bolt), said he heard the hissing of pressure escaping and he never had A/C after that.

Now my questions are... does the A/C need to be re pressurized? Does it need a new charge, if so can you still get old frion? where should I start? Summer will here soon and this is a priority for my son to get fixed. PLEASE advise !!

Thank you : )

BCMIF150

You probably can't fix it yourself. Find a good A/C repair place. They can check for leaks, evacuate the system and fill it properly.

Mailho69

I am curious to know which bolt was loosened to cause a hissing sound. I have a 78 that I have resurrected the AC on.

77Ranger460

I have a '77 with original factory air. If the previous owner loosened the bolt (plug) on the top of the compressor, the charge leaked out... Been there, done that. Lol. ..it is the plug in the pic under the black wire. I was taking it out to check the oil level.

Mailho69

Ok. I understand now. If you have an Auto Zone near you, they should have a vacuum pump you can rent to evacuate the system before a recharge. I highly suggest having a set of a/c gauges for this procedure nad a basic understanding of how the system works before recharging the system. Otherwise have a shop do it for you.
A conversion to R134 is highly recommended since the original R12 is very expensive and is almost impossible to get. You even need a certification to purchase it if you do happen to find it for sale.

77Ranger460

Or... You can put in Envirosafe. You do not draw down a vacuum. It have had it in my 1977 for 3 years and my Mustang for 6 years. Both have ice cold AC.