Hi AC folks -

W123 / 82 300D

- 30 minutes vacuum pump time, vac held overnight properly
- charged with 2.2 lbs of R12 this morning
- compressor engages when turning cooling system on
- 40 degrees now at the vents in idle, in park
- measure with the gauge and the high and low side pressures are identical 30PSI with the car idling
- ambient temp is 80F, 50% RH
- compressor does not seem to be cycling, it's always on

its working...but the high side is totally confusing me . the whole system is new, flushed, vac'ed, pressure tested etc.

thank you in advance :-)


SOLUTION:

OK - so problems identified and solved.

1. My gauge set hoses don't depress the valve core. The set I have, the brass tab isn't long enough to push in the core, so it can't take a reading. Grr. Ordered another of a different brand, but it looks like it has the same issue.

2. I had no valve core in the low side - it didn't come with one. So the reading I was getting were indeed just from the low side. There was also some pilot error on my part operating the gauge set.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car