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AC Issues 87 stang
#1
I have an 87 Stang, original R-12 car, that I have been having problems charging. We have tried now three times to charge it with 134a. This is not the first time that we have done this (r12 to R134a), but we have not these many problems before.

Basically, I had bougt the car from my friend. The AC quit on him probably two years before I bought it. When I got it I tried to charge it. It leaked out within a few days. Then, we tried again but with the UV dye. Found that there was a leak at one of the O-rings on the high side of the system. So I replaced them, placed PAG 150 oil in the system, and charged it again. Now that quit again after a few days. We didn't see any obvious leaks this last time. I'm afraid the compressor (which charges well up to 350 psi) might not e able to hold the pressure on the high side. I dunno. This sucks. It is prolly somethin small and stupid. Any ideas?

Another question, I have a compressor off of a 94-95 engine. Could i bolt this up? Or will I have problems with fitment, belt alignment, etc?
* 1987 5.0L LX 5-speed – no times yet

intake spacer, shorty headers, 2.5" after cat, 3550 w pro 50, king cobra, accell coil, (5 lug conversion w/ disk brakes from SN95, 4.10s, 99-04 Factory "Torque Thrusts") :drevil: ([SIZE="1"]it only took three years[/SIZE])

* 2000 F150 supercab – 1/4: 15.76 @ 86mph @ 4640lbs

5.4 Triton ~ 3.55L/S rear ~ auto ~

* '64 T- Bird Landau 390 4 barrel (one of 22,715) – 16.9 @ 80.94 mph @4586lbs

stock… a work in progress… (will be built to RUN :evil: )

Idle softly and carry a big Stroke.
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#2
Quote: I'm afraid the compressor (which charges well up to 350 psi) might not e able to hold the pressure on the high side. I dunno. This sucks. It is prolly somethin small and stupid. Any ideas?

Another question, I have a compressor off of a 94-95 engine. Could i bolt this up? Or will I have problems with fitment, belt alignment, etc?
What do you mean by 350 PSI? That pressure is way too high for the high side. If the system is operating properly, the high side should be anywhere between 150-300 (300 being max, unless hells fire came that far north)

Im going to say that on a 80* day the high side should be 200-250 with the controls on normal a/c, high blow with the engine at 1500 RPM. Low side should be around 30-35 psi.

Things that cause high side pressures are: excessive charge of refrigerant, Air in system, blocked condensor airflow, condensor fins bent, ***Fan clutch or electric fan failure***, Blockage in condensor, or plugged orfice tube.
Also recheck for leaks. Check that evaporator drain.

As long as the compressors LOOK the same ( 87 should have been a 6 cyl nippon denso while the 94-95 could be a sanden 10P) there interchangeable AFAIK.
ASE Master Tech with 15 years experience


Daily Driver: 1994 GMC Sonoma, Extended Cab, 2WD, with the 4.3 V6 Vortec.
Future plans/projects: Finishing that darn 64 Malibu SS
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