My a/c was working perfectly till yesterday when I started the car after sitting for three weeks. Upon start I noticed a slight noise from the compressor when I engaged the a/c. All that I got was warm air coming from the vents. I then checked to see the compressor was engaging which it was....the two fans were running normal and my temperature switch inside the vehicle worked correctly.
i took the car for a drive to see if getting air to the evaporator would help....but nothing, same issue, warm air coming from vents.
i then got my a/c gauges out and found that my low side was at 75 PSI and My high side was at 100 PSI...
Could it be the compressor or something else?

my car is a 2001with 102K original owner miles.

 

Pressure sounds right. Is your lines freezing up? Sound like a blockage

 

Nope. The lines are warm/hot. I thought the low pressure should be at between 35-45 and the high side at 200Plus?

 

Running I assume?

 

Yes. The low 70 high 100 psi is while running.

 

Do a evac and recharge. High side is low. Should be around 150. Sounds like it’s undercharged

 

Can't simply add refrigerant, gotta evacuate the system and refill it, oil and refrigerant.

 

So today I went out to do a few measurements of the clutch. My clearance between pulls and armature plate is approx .032 (813mm) inches and specs says .015mm plus or minus .05mm.

Car off ( temp outside 86* - 70* hum )...low side 90 / high side 90 psi

Car running 1k rpm - low side 80 / high side 100

upon Heavy acceleration low side down to 0 and goes up Again once off gas....

 

Mine did the same thing. Changed out the dryer and all was good.

 

Best way to start instead of assuming is have a shop evac, recharge to spec and add dye so if it’s leaking somewhere you can find it with a uv light.