Automotive Air Conditioning Information Forum

Update.
Replaced compressor and getting a lot more cooling. I am figuring this was the issue. Came across a Youtube video that showed exactly what I was experiencing and they attributed theirs to a weak compressor.
Something that compounds the issue is the 'automatic' temperature will only go down ...

Cooling at idle near 700 rpm is near non existent. Kinda sorta feel some cooling but not much. When driving, so rpm is higher usually above 1500rpm, the air out of the vents is cool, not cold just cool. Higher the rpm the cooler the air gets to a point. Charge weight is what it should be when ...

Viscous clutch fan is missing because the engine has been swapped. The new engine only has electric fans not option for a mechanical fan.
The compressor came with the engine. It was running and working when the project began a few years ago. The ports were blocked off at that time.
There is no ...

Looking into the EPR valve. It looks like changing the setting on the spring takes a degree in HVAC that I don't have.
Is it possible to adjust the spring pressure to get it to work with R134a. I am assuming so since they do make them for 134a applications. Am I looking to reduce the spring ...

I am not sure what the value of the EPR is set to. Most likely a value that works with R12. I can't find any documentation on it.
I am looking at the charge chart for 134a and I miss read kPa for the PSI value. Should be close to 150 on high side. So the system is over charged?

Sorry not oz. 30cc

I have read a few posts here and can't seem to find one that is similar to my situation.

1983 Toyota Celica Supra, converted to 134a.
Recently got my A/C system up and running after many years sitting with no refrigerant in the system. Replaced all the o-rings. Noticed some gunk on the connections ...