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gnlandrus · 05-11-2021, 01:42 PM

Dash air was blowing warm. Checked the ac system and it was empty. Had a leak and it was a Schrader valve.
I vacuumed the system found no leaks after 24 hours so I refilled the system and now the low side readings are high, and the high side readings are low. Added about 3 lbs of Freon so I don’t believe the system is over filled.
It’s blowing cold and the compression running.
Any thoughts on where to start looking ??

Timaz · 05-11-2021, 02:07 PM

Check this out.

https://www.perrinmfg.com/resources/gauge-diagnostics

Tim

RustyTools · 05-12-2021, 07:32 AM

Following this closely, Greg, good luck. Coincidentally just inherited my parent's car, and it's doing the same thing.

gnlandrus · 05-13-2021, 07:08 AM

Ok, here is update. I forgot to mention that before I refilled the system, I pressurized it with nitrogen. I took it up to 200 psi and let it sit overnight and it didn’t drop at all !! I then added 5, 12 oz cans, 3.73 lbs, of Freon.
I made a dumb mistake and left the valves at the manifold OPEN , when checking the pressures!!! That caused the bad pressure readings.
My actual readings are, low side and high side readings, with compressor off are 33 & 118 & compressor on, 18 & 155. It is cooling like crazy. 43* - 45* at the vents.
I am surprised there wasn’t more evidence of the leak at the schrader valve, but it was a very slow leak and my last charge was last spring. Hopefully , that is the problem🤞🤞
Obviously I will keep a close eye on the ac system and will report back.