I have searched the archives but could not find an answer to my problem.

Car: 1986 300E
A/C: R-12 system

Problem – the A/C does not cool.

Here’s what I have observed so far:

• Compressor kicks in and doesn’t cut out.
• There is refrigerant flow – I can see it flow via the sight glass in the drier (when I turn off the A/C, there is no flow) – there are very few bubble – I can see liquid flowing
• The aspirator for cabin temperature is working (the little piece of paper I placed in the grill in the dome light stayed there)
• Turned the temperature wheel to Min and the fan comes on full blast

But the system doesn’t cool at all. I haven’t hooked up gages to check the pressures.

Could the system be low on refrigerant or is the mono-valve stuck open?

Suggestions please!!

__________________
1986 300E (3/2002) Rear ended and totaled (10/2009)
2000 Xterra (5/2000)
1992 400E (11/2009) -Sold
1986 300E (12/2009) - Sold
2004 E500 Wagon (6/2013) - Sold