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Pulling a vacuum; What is removed, and what stays in...
Topic Started: May 24 2018, 11:45 AM (217 Views)
Mrbreeze


I purchased a 95 tracker back in November, I rarely drive it, but yesterday I put a gauge on the low side, at first it works good, but it builds pressure than kicks off, the needle is steady, it just builds pressure than kicks off, I'am sure it's the pressure sensor, but what is/could be causing the system to behave that way? Once it reaches that point, I don't get anymore cold air, and the low line just stays warm.. it gradually increases pressure to if I remember correctly, around 100psi, I need to pick your brain if you have more knowledge than I do.. thanks again..
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freegeo
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Goegonfa can help you. He will be around.
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geeten
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Driving little, Flying little
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Mrbreeze
May 24 2018, 11:45 AM
I purchased a 95 tracker back in November, I rarely drive it, but yesterday I put a gauge on the low side, at first it works good, but it builds pressure than kicks off, the needle is steady, it just builds pressure than kicks off, I'am sure it's the pressure sensor, but what is/could be causing the system to behave that way? Once it reaches that point, I don't get anymore cold air, and the low line just stays warm.. it gradually increases pressure to if I remember correctly, around 100psi, I need to pick your brain if you have more knowledge than I do.. thanks again..
Do you mean high side instead of low? Low side should not have positive pressure. If you mean the high side, then I'd suspect a restriction, probably ice caused by moisture in the system. To fix replace the dryer, if there is one and draw a vacuum on the system. (We draw a vacuum to remove moisture because water boils at room temp in a vacuum and can be removed as vapor) Replace with fresh refrigerant. g10 out.
Edited by geeten, May 24 2018, 02:38 PM.
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geogonfa
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:gp

The high side will gain pressure...the low side will drop to a vacuum...are you using an ac manifold set or just a signal gauge?
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Mrbreeze


I should have stated that this was a 2part question, I want to know if the oil remains in the system under vacuum, what's left in it, or if I should pull the compressor and drain any remaining.. also the pressure was checked on the low side with a single gauge, I do have a set of manifold gauges, but I've only used them with the vacuum pump and to recharge.. the other cars maintain a nice low pressure, 35-45 psi depending on ambient temperature...
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blue_can
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I would suggest using a manifold gauge set and also checking the high side pressure. A symptom of a failing compressor is a higher than normal low side pressure and a lower than normal high side pressure. If the high side is low then I would suspect the compressor.

Yes the oil will remain in the system even when you evacuate so if you want to remove the oil you will need to drain the compressor.
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flatfrog
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I would agree with you, the pressure switch would seem to be kicking off. I would add some freon and see if it stops cycling, if it is cycling. If it does stop cycling you can continue to charge the system. If the low side pressure drops , the system kicks off and doesn't come back on, then I don't know what to say, hopefully another member with a lot of AC experience will know.
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