A/C Clutch intermittingly remains energized after engine is cut off?

Tiny
JAZZBAMA
  • MEMBER
  • 2014 JEEP GRAND CHEROKEE
  • 3.6L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 133,000 MILES
Several weeks back, the SUV would not crank, the voltage on the battery was about 4.65 volts. Jumped it off and it cranked right up, and the voltage was reading 14.25 volts. Drove to auto zone, they tested the battery and alternator both indicated good based off their testing. Drove home and two days later, same thing, battery at 5.34 volts, jumped it off and again drove to AutoZone and the battery failed load test. Installed new ACM 180 battery, crank up and tested okay. A week later, you guess it, battery was drained 1.95 volts pull the battery out and place on charger 2amp - removed the alternator and carried to auto zone to have it tested while battery recharged. Alternator tested bad. Replace alternator and installed recharge battery 12.75 volts and ran for 4 days and battery is dead again. I started looking for a parasitic drain. Battery was showing 4.26 volts, I removed fuse F49 and voltage start increasing slowly. F51 when pulled it would drop increase voltage a little. I replaced all the fuses except F62 for the AC clutch and charged the battery back to 12.57 volts. Start the SUV with no issues. I shut it off and replaced the AC clutch fuses and it did not click. Started the SUV back up and noticed that with the dual climate control off, no manual AC on, that when I cut the fan on cold air was blowing out of the vent. I cut on auto controls and ran it up to high for both sides and got hit but clutch never released. I cut on manual A/C and off and clutch released. Cycling this a few times the compressor continued at times to continue to cool even thought the auto dual controls were off and the manual AC switch was not depress and it did not have a light on. I shut the SUV off and when I pulled F62 fuse the A/C clutch disengaged. I set my meter up again to measure voltage drop when the engine was cut off and with that fuse installed the voltage started dropping. What causes the A/C clutch to be still energized after the motor has been cut off?
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Tuesday, November 29th, 2022 AT 7:26 PM

5 Replies

Tiny
KEN L
  • ADMIN
So, the A/C clutch relay has gone bad and sticks, I would replace it to fix the problem here is the location which is under the hood in the fuse panel on the right side of the engine compartment. Check out the images (bBelow). Please let us know what happens.
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Thursday, December 1st, 2022 AT 2:47 PM
Tiny
JAZZBAMA
  • MEMBER
That was my first thought as well, however, there does not appear to be an A/C clutch relay or not one identified in the fuse box. Did not see a relay list in the fuse box as you described - I have had relays to stick and even weld together before and had original thought the same thing when I was troubleshooting but I could not locate - I believe that it controlled by the HVAC module, but I have not located and ac schematics to verify.
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Thursday, December 1st, 2022 AT 8:14 PM
Tiny
KEN L
  • ADMIN
Okay, even though it shows it in the wiring diagrams the relay is internal to the PDC (power distribution center) and cannot be replaced. You might be able to disassemble it and unsolder it to install a new one, if not you will need to replace the PDC. Check out the images (below). Please let us know what happens.
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Friday, December 2nd, 2022 AT 11:29 AM
Tiny
JAZZBAMA
  • MEMBER
Took it to the dealership and they replaced the PDC. I will updated if this does not solve the issue. Thanks for the help.
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Saturday, January 21st, 2023 AT 7:19 AM
Tiny
KEN L
  • ADMIN
Sounds good.
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Sunday, January 22nd, 2023 AT 11:40 AM

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