Volvo RWD 900 Forum
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SAVE High pressure mean too much 134A? 900 1994
posted by Philip on Tue Jun 23 09:57 CST 2009
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last visit: Wed Nov 18 10:14 CST 2009[RELATED]The guy at the compressor rebuild shop says I have too little R134 and to slowly add until the pressure comes down to the correct range. I'll try it this weekend.
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SAVE High pressure mean too much 134A? 900 1994
posted by Philip on Mon Jun 29 13:58 CST 2009
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last visit: Wed Nov 18 10:14 CST 2009[RELATED]I added more and the pressure kept going up. I talked to him again and he was frustrated when I told him there was no place to read the high side. They are sending me another compressor.
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SAVE High pressure mean too much 134A? 900 1994
posted by
jbowers
on
Thu Jul 2 14:39 CST 2009
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last visit: Thu Sep 3 09:31 CST 2009[RELATED]Hi Philip,
I'm wondering why you ignored the advice from "dewfpo"? He was quoting right out of the Volvo manual.
I'm also wondering why you elected to replace a compressor that was "working"? The control works by cycling the compressor to keep a constant pressure drop range at the dryer/reciever. There is no need for a high side pressure reading. Your "advisor" doesn't seem to know how the new Volvo system works. He is assuming the functionality of an older system I think.
In order for the cooling to be optimal in this system you need the proper amount (weight) of R134a and compatible oil in the system. You didn't mention any oil, a new orfice, or new dryer/reciever in your system repair.
I replaced my compressor several years ago because the oil got low leaking by case seals in the compresssor housing. This in turn caused a lot of friction and resulted in broken links at the clutch. At the time of the repalcement I put in new 'O" rings, a new orfic, a reciever/dryer, and replentised the PAG oil. This was followed by a good "vacuuming" and finally with the proper amount of R134a. The system performed flawlessly for a couple more years until the condensor got a hole in it from corrosion. I found the hole using florising dye and a black light. This time after replacing the condensor I only vacuumed the system and installed the amount of R134a as described by dewfpo. I now have a slow leak that I haven't been able to find such that every other year I've been vacuuming the system and replacing the R134a by weight. System has continued to work well with about 41 F degree air from the vents after installing the R134a.
--
'96 965, 16' wheels, Michelin Pilot Sports, rear 18mm bar + Koni, 201 HP cams, 149K. Put 200K on '85 745 TD.
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SAVE High pressure mean too much 134A? 900 1994
posted by
dewfpo
on
Mon Jun 22 15:37 CST 2009
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last visit: Sat Nov 21 19:09 CST 2009[RELATED]Let's see, the system on a 960 takes 1.96 lbs or 31.36 ounces of R134a. The cans I have are 12 oz cans which means (if yours are the same size) that you installed 36 ounces or 4.64 ounces too many. That's 15% too much. R134a systems are not as forgiving about overcharging than R12 systems. You may gain some cooling efficiency back by removing the excess.
DEWFPO
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1998 S90 083,228 and 1995 964 154,100
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