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94 Saturn - Low Pressure on High Side
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stilles
New User
Jul 11, 2011, 8:48 PM
Post #1 of 5
(8450 views)
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94 Saturn - Low Pressure on High Side
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1994
Saturn SL2 (sedan model)
1.9L
170k mi
Pressure Readings:
Low: 50
High: 50-55
Outside Temp Here: ~100F, 60% humidity
Originally didn't check the High side, just recharged the Low back to the optimal level based on the outside temp (99F). The pressure seemed to go up somewhat quickly (took about 8 minutes)
I have completely discharged and pulled a vacuum on both sides for about 65 minutes. It did not appear to leak when the manifold was closed and the vacuum shutoff.
I recharged the Low side from 0 back to ~50 (Had to pull the battery to get the compressor to turn back on) but the high side is barely creeping up. The more freon I push into the LOW the higher the HIGH goes. (am not pushing anything into the high side).
The air is blowing just as hot as when I started, AC set to full and recycle air on.
Everything I try to search for is about "low pressure on low side
, when I have "low pressure on high side".
The LOW side is holding freon just fine, it has been almost 2 weeks and might have went down just a bit (outside temp has been anywhere from 85-105).
(This post was edited by stilles on Jul 11, 2011, 8:49 PM)
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Discretesignals
Ultimate Carjunky
/ Moderator
Jul 11, 2011, 9:07 PM
Post #2 of 5
(8437 views)
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Re: 94 Saturn - Low Pressure on High Side
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You need to charge by weight and not pressure. The system refrigerant charge is 1.5 lbs. You need a scale and charging cylinder to put in the correct weight.
Once you have the correct weight of refrigerant charged then check system pressures. If you still have equal low pressure on the high and low sides and the compressor is engaged, the compressor is probably faulty. The Zexel compressor is a variable displacement compressor and could have a faulty control valve.
If you do go to replace the compressor, it wouldn't be a bad idea to replace the drier and expansion valve at the same time.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 11, 2011, 9:13 PM)
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stilles
New User
Jul 11, 2011, 9:41 PM
Post #3 of 5
(8428 views)
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Re: 94 Saturn - Low Pressure on High Side
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The low pressure reading is just about touching the red zone. But I should charge by weight and ignore it dipping into the red?
I stopped charging with concerns to safety when it got past 55. The can won't blow up if I charge the low too far will it?
Could I charge LOW until the HIGH side is where it needs to be? And would it be safe to assume putting 22oz in would be equal to 1.5lbs? 22/16oz=1.5lbs?
Edit: It does use 134, not 12.
(This post was edited by stilles on Jul 11, 2011, 9:42 PM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 12, 2011, 3:13 AM
Post #4 of 5
(8413 views)
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Re: 94 Saturn - Low Pressure on High Side
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This is why A/C is not a DIY repair.
There is far too much to be known before attempting to diagnose a system like this. You have to follow discretesignals instructions for charging with the correct amount of refrigerant. Then and only then can you have any idea what the problem is in the vehicle. The low side isn't where your safety concern it. It's the high side going over 350PSI that you have to worry about and making sure none of that high pressure ever finds it's way into your can because you hooked something up wrong. We don't recommend you attempt this yourself in any manor because the danger is only part of the risk. You can easily cause serious damage to the system also.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jul 12, 2011, 5:41 AM
Post #5 of 5
(8406 views)
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Re: 94 Saturn - Low Pressure on High Side
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stilles: Quote">>The low pressure reading is just about touching the red zone. But I should charge by weight and ignore it dipping into the red?<<"
In that you even said that this isn't for you. Do parts replacements and still know what you are doing or send it out or risk mega bucks in damage or worse hurt yourself.
Send it out for the vac and charge until you have the proper equipment. Red zone! NO - that sounds too much like a "death kit" gauge.
If you want and should, read the top post on charging procedures right here. That's the finish when you know everything else is fine!
It's not fair of some of the marketing of A/C junk out there suggesting how easy it is. WRONG. As Hammer said this isn't a good DIY sport.
These guys know what they speak of. Everyone want to save a buck and this is the wrong area without comprehensive know how and even then stuff happens or goes wrong. Pros would know when to stop and look for the trouble when it isn't going right,
T
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