Hi everyone! Ok so I have a 93 f-150 5.0L. Got a little low on R12 because I overheated a little bit (electric fan I wired up lost connection and I didn't notice till it got to 205 degrees or so, that is assuming 185 is normal for these trucks) anyways. So I bought the nipples to convert it to r134a because the only place (which will not be named) I found that would sell me R12 wanted $25 a can... So I figured I'd just convert it. So, it says the system took 2lbs and 11oz. originally if I remember right. So 36oz. is about the 85% they say to do for converting. I shot for that but it got quite hard to because I realized one of the new nipples was leaking some. So after I got done putting some in and realized it. I got one more can and put about half of it in assuming I'd lost a few oz. before I caught the leak. Well, first two times I drove it after (at dusk) it blew cold air just fine and the compressor was constantly running. Well, two days later I go out during the day, and then it would stay cold a while, then the compressor would shut off and didn't come back on till the air got warm.. Could I have overfilled it thinking the leak let out more than I thought? Gauge read ok... But would this be a symptom of overfilling?

 

$25 is a steal for R12.

 

That's what I was thinking. I paid $30 a can for R12 back in 1998, and glad to get it for that price.

 

No decision on what the problem is?

 

Thats a dang good deal, we were putting it in coolers a couple of years back for $50 a lb.

Sounds like maybe the evaperator is freezing up, you really needed to have changed the drier and orfice and pull the vacuum before you charged it. Your not going to know whats going on with a system till you hook it up to a real set of gauges. That way you can check high and low side pressures to see how the system is acting.

 

What is the canister looking thing that the low side port is connected to? what is it called????

 

I'm trying to figure out why is truck overheating caused the A/C to need freon, maybe he needs antifreeze instead???

 

Sounds like the Drier to me....

 

It is the drier. Thanks. Could not think of it. The needle valve in it sprung a leak and would not shut back. After it leaked everything out it left a hard tar-like substance that blocked up the valve so I couldn't do anything with it. But I believe it's a good idea to get a new drier anyways, especailly only 45-50 bucks for a new one. Not THAT big of a deal.

 

No Harley. What happened is, I changed my truck from a mechanical clutch fan to an electric fan (less parastatic drag), and one night the wiring got a bad connection (because I did a rush job on the wiring the first time). When that happened the motor warmed up a bit sitting around idling with the AC running. When it did it opened up a pressure relief valve in the system I guess from the increased pressure from the extra heat. And it let out some r12. It ensures you don't over pressurize the system and ruin your compressor.