A/C compressor shuts off when it is hot

170,000 MILES • 2.0L • 4 CYL • 2WD • AUTOMATIC
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RLAMONICA
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  • 3 POSTS
The AC compressor clutch engages and ice cold air come out of the vents after we purchased an AC Pro recharge kit and added a bit of refrigerant, but it did not last.

The issue seems to be heat related because if we use the AC at night it will consistently blow cold air for as long as we want. During the day is a different story as the compressor clutch will disengage after about ten to fifteen minutes and only hot air comes out of the vents. We have taken the car on a ride on the freeway and stayed in the driveway both with the same results after ten to fifteen minutes of running the car with the AC on.

I am not sure if the system is overcharged and when the system heats up it trips a pressure sensor and shuts down the clutch on the compressor or if there is something else going on?
May 19, 2018 at 9:04 AM
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BMDOUBLE
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  • 1,139 POSTS
I would start by retrieving trouble codes from the PCM and verify the cooling fans are operating. Seems to be temperature/pressure related and most of these that I have seen seem to have fan issues.
May 20, 2018 at 5:56 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,627 POSTS
Yes, it does sounds like the system is over charged. Here is a guide to help you confirm the issue:

https://www.2carpros.com/articles/re-charge-an-air-conditioner-system

This guide can help as well.

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Please let us know what happens.

Cheers, Ken

May 21, 2018 at 3:26 AM
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RLAMONICA
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Update:

I checked error codes and there were none. Both fans are running and pulling air through the condenser. While using the OBD2 scanner I did notice after a while the (ACP) sensor reading went from Open to Closed and kicked off the compressor clutch

I then had to wait a few hours for things to cool before I could get the compressor clutch to to engage again to get readings with a set of gauges. It is currently 77° and I have got an LP of 24 and a HP of just over 150 (see photo). The LP started around 30 then after ten to fifteen minutes dropped to 24.

Everything was running ice cold as it usually does at night. The only difference tonight was when I cycled the AC off then back on the clutch would not engage again even though it was cool out.

I am thinking I may have to take it to a shop, but its just so expensive. $130.00 to recover and recharge even though a machine does all the work at most shops.
May 23, 2018 at 4:37 PM
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RLAMONICA
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Static pressure readings as well in case it helps, LP 73, HP 70.
May 23, 2018 at 4:41 PM
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STRAILER
  • ✓Experienced Mechanic
  • 55,627 POSTS
Those pressures are low add more refrigerant the high side should be closer to 230.
May 24, 2018 at 4:09 AM
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