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Old 03-26-2007, 07:37 PM   #1
JETMECH
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Default Another A/C question


I guess it is the season for A/C problems, but I thought I would ask before giving up and sending it to the shop. I'm having an issue with compressor operation. Its a long story but here goes. For starters, I changed the compressor out after the clutch gave up on the last one. The system has been converted over to R134A and has worked fine for the last year and half until the clutch died. I took the vehicle to a friend who has gauges and a vaccum pump. We sucked it down and it held without moving for over 30 minutes. When we added the freon, we had the compressor jumpered to the battery for operation and it worked fine while servicing. The sticker on the car says 2.25 lbs but that was for R12. We put 2 lbs. in it and pressures were 32-34 on the low side and 175-180 on the high side. After servicing, we could not get the clutch to enage with out it being jumpered. We thought it might be the pressure switch but after putting a jumper on it and still no operation were kind of at a stand still. It seems that there is absolutely no power going up to it. I checked the fuse and it was good. Any suggestions on what we might try next? While I'm on here, I do have to give props to the seafoam endorsement and help with troubleshooting ECTS. My car just turned past 250K for mileage and is still getting 32-33 mpg. Thanks for the help guys!

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Old 03-26-2007, 09:36 PM   #2
Joeybagodonuts
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sounds like you may be overcharged, depending on model saturns do have ahigh pressure switch also, and if you add to much there a blow off valve on the back of the comp that will just shoot out freon but slightly overchagred can be just as bad as undercharged as the system wont operate properly. it takes about a pound and half for most s series to reach optimum cooling.
oh crap, sorry i thought i read it was stating on when jumped....oops.. ok, lets start fresh, did you check the basics the a/c relay?...
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Old 03-27-2007, 08:37 AM   #3
JETMECH
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First thing on my list tomorrow. I didn't know it until tonight but one of the A&P mechanics I work with is an ASE cerified car mechanic that use to work for a GM dealership. He's going to swing by tomorrow to help me figure this thing out. Wish me luck.
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Old 03-27-2007, 10:25 PM   #4
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ok, let us know if you need help, me and tommy and some others are very familar with saturns a/c systems
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Old 03-28-2007, 03:55 AM   #5
Ssicarman
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I believe that the normal R-134 fill into a converted R-12 system is 80%. so you are are overfilled.
Have you checked ALL of the fuses in the car? Under hood and in car fuse blocks. AC light on the HVac control lighting up when the button is pressed? Power to the pressure switch by the fuse block?
What are your engine off AC pressures?
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Old 03-30-2007, 04:19 PM   #6
JETMECH
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Sorry I didn't get back quicker. We finally found it. We ended up tracing it back to the fuse block under the hood. I'm just glad it turned out to be something like wiring instead of a component. He mentioned the same thing that I may be pushing the system a little on the high side with servicing. I'm debating about leaving it because its operating fine but then again I don't want the premature wear. I want to try and keep the old Saturn going for a long time, especially after the gas spike in the last few weeks. It definitely is nice to have cold air again!
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Old 06-14-2016, 02:30 AM   #7
partynow
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Quote:
Originally Posted by Joeybagodonuts View Post
sounds like you may be overcharged, depending on model saturns do have ahigh pressure switch also, and if you add to much there a blow off valve on the back of the comp that will just shoot out freon but slightly overchagred can be just as bad as undercharged as the system wont operate properly. it takes about a pound and half for most s series to reach optimum cooling.
oh crap, sorry i thought i read it was stating on when jumped....oops.. ok, lets start fresh, did you check the basics the a/c relay?...
i had a similar problem, i had my system overcharged. when i got it evacuated. system worked perfectly.
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