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katomun
New User
Sep 21, 2015, 4:00 PM
Post #1 of 8
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Line pressure question
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Hi everyone, I have a '95 Mazda 626 2.0. Originally, low side was reading about 20- 25 psi and high side read very high about 195-200. I replaced the expansion valve and dryer. Tried blowing out the high side lines and the evaporator with an air nozzle. Replaced all of the o rings. Now, after recharging with a 12 oz can, the pressure now reads low side about 60 and high side about 100. Did the compressor just go bad? Thanks.
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Discretesignals
Ultimate Carjunky
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Sep 21, 2015, 5:24 PM
Post #2 of 8
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Re: Line pressure question
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The pressures originally looked good. Was it not cooling?
Did you evacuate the system before adding refrigerant? System capacity is 1.54 lbs.
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 Sep 21, 2015, 5:27 PM)
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katomun
New User
Sep 21, 2015, 6:23 PM
Post #3 of 8
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Re: Line pressure question
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It was blowing warmer than usual, It's been several months since I worked on my car but if I remembered correctly, low side was actually about 15 and high about 140ish or so. I added a can and low side stayed the same and high side shot up to 200. Checked online diagnostics and came up with a bad expansion valve. I evacuated the system for about 45 minutes with a vacuum pump and let it sit for a while after replacing. No leaks. The pressure now reads low side about 60 and high side about 100.
(This post was edited by katomun on Sep 21, 2015, 6:38 PM)
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Discretesignals
Ultimate Carjunky
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Sep 21, 2015, 6:37 PM
Post #4 of 8
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Re: Line pressure question
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The high side is going to go higher with more refrigerant in the system, but 200 isn't unusually high.
The system has to have the proper weight refrigerant in it to diagnose it properly.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Hammer Time
Ultimate Carjunky
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Sep 21, 2015, 6:50 PM
Post #6 of 8
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Re: Line pressure question
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I don't know what you did but you turned a good low pressure reading into a bad one. You've got signs of a bad compressor now.
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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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Discretesignals
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Sep 21, 2015, 6:58 PM
Post #7 of 8
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Re: Line pressure question
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This sounds like a mess and you should start over. You should have someone with an ac recovery machine recover what you have in it and then recharge it to the correct weight using a cylinder and scale. Then see what your readings are.
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 Sep 21, 2015, 6:59 PM)
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Tom Greenleaf
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Sep 21, 2015, 9:24 PM
Post #8 of 8
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Re: Line pressure question
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Here we go. OP, did you blow lots of oil out of system too with those tricks? Charge has to be on target if you have to start over from a full vacuum. Said right away pressures seemed fine so was/is something else now random blasting in refrigerant probably caused a problem and original problem till exists.
High side pressure look for 2.5X the air temp (F) going in thru grille at 1,500 RPM or around there, fans running.
1.54 lbs of charge is going to be tough to get spot on and probably way off and need help with equipment. Too bad IMO that you messed with it,
T
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