Yes, I realize that opening up the system to do any repairs requires the system to be evacuated. Sounds from the pressures that he showed me that it is working ok. The damnest thing - yesterday when I was out driving, the A/C seemed to not be very cold (85 degrees ambient). Today,
again about 85 degrees out, I ran it in the garage and measured the
vent temperature. It was 42 degrees. I must have had something else set wrong yesterday, like the temperature dial !! ;-)

Anyway, it seems like maybe it is working fine. Does 42 degrees at the vents seem normal?

I'm gonna use it for a few weeks and see how it performs. Thanks guys for the info. A/C is one area that I don't much about.

 

Temperature-Pressure chart for r12
33F = 30.9psi
100F = 116.9psi

 

Sounds like a good plan, Brad. Maybe the only problem was operator error.

Kevin the T-P values would be the temperature of the R12 in the evaporator and condensor, right?

 

I love when it's operator error - it's so cheap to fix !

 

Actually that is a chart showing the temp and pressure relationship of r12.

 

Kevin, the low side pressure is the pressure of the R12 in the evap, right? Then the temp of the R12 in the evaporator can be determined from the low side pressure using the temp-press chart?

 

On the inlet side of the evap coil is Low Temp/Low Pressure Liquid that cools the air as it passes to the ducts. Outlet side of evap is LowTemp/Low Pressure vapor. So the t-p relationship should refer to the refrigerant in the evap coil.

 

Thanks for the explanation, Kevin. I always learn something from your posts.

 

Steve, thanks for the compliment.=! You mentioned you took the 609 certification recently, are you a automotive technician?

 

Kevin,

I haven't taken the certification, but I might do it in the future.

And I'm not an automotive technician, just a backyard mechanic like a lot of people who grow up in the South. I'm actually an engineer, so I just naturally love technical stuff.