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Bought car in March--127,000--many signs of neglect. A/C evacuated, charged, leak -tested (sniffer) on 6/24. Been fine since (42F lowest at road speed, digital reading at center vent). 8" puddle under condenser this AM.
Relevent work history:
> In May, I replaced small hard line out of condenser "manifold" (?) block. PO had tried to fix w/compression union. No joint leaks when charged 6/24.
> A/C servicing details: 1.96# R134A, 1.5 oz. PAG. "System pressures high." (Ambient about 80F, don't remember what actual pressures he said). Cold air & no sign of leak since serviced 6/24. Till now.
> I replaced radiator yesterday, road tested & ran A/C. No coolant leaks nor (obvious) A/C leaks till this AM
> Flushed leak area w/brake cleaner and ran A/C. Leak appears to be from just above Manifold Block with 3 sensors.
> Line I installed attaches at end of MB. No thread or fitting leaks at this point.
My guess is that with "high" system pressures, 10 years, and now 128,600 miles, it's time had come. I was careful to counter-hold the MB with crescent when I put the small line on. And don't believe I got near the leak spot when putting radiator in yesterday.
Service guy (local, rural, good rep) said high pressure might be due to "clogs" in system. What would be safe pressures at 80F? Any other thoughts?
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Bruce Young, 940-NA, many 240s (one V8), '73 142, '71 144 (ex circle track car in CT), '67 144 (new), used 122 from '63 to '67
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