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A/C compressor runs with heater on

Tiny
SCOTTDQ001
  • MEMBER
  • 2016 JEEP WRANGLER
  • 3.6L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 50,000 MILES
Hi,

My A/C compressor runs with the heat on in all modes, when it is raining. Other than that it only runs in defrost, like it should.
Tuesday, December 10th, 2019 AT 11:25 AM

10 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

Do you have automatic climate control or manual control AC?

The automatic will always activate the AC compressor for humidity control.

The manual should only work on defrost mode.

Roy
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Tuesday, December 10th, 2019 AT 12:52 PM
Tiny
SCOTTDQ001
  • MEMBER
  • 15 POSTS
Not automatic, manual control.
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Tuesday, December 10th, 2019 AT 1:50 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, there is a module under the hood called a totally integrated power module. It controls all body functions including the AC controls. The control head you use to command sends a signal to this module and based on that input, it turns the compressor on and off.

This module is a common failure. With the age of your Jeep, I would question if it is covered under warranty.

Roy
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Tuesday, December 10th, 2019 AT 2:10 PM
Tiny
SCOTTDQ001
  • MEMBER
  • 15 POSTS
Hi Roy,
That module was already replaced, it was covered under warranty, do to the parking lights not shutting off.
Thank you
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Tuesday, December 10th, 2019 AT 2:32 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You need to have that rechecked to see if it has the proper programming in it. The wrong program will cause this.

Roy
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Tuesday, December 10th, 2019 AT 2:33 PM
Tiny
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Okay, thanks.
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Tuesday, December 10th, 2019 AT 2:37 PM
Tiny
ASEMASTER6371
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You are welcome.

Looks like it may be programmed for the automatic climate control system.

Roy
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Tuesday, December 10th, 2019 AT 2:49 PM
Tiny
SCOTTDQ001
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  • 15 POSTS
Okay. Thanks a lot for the info!
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Tuesday, December 10th, 2019 AT 4:35 PM
Tiny
SCOTTDQ001
  • MEMBER
  • 15 POSTS
Come to think of it, I didn't have this issue until it was replaced. Thanks again!
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Tuesday, December 10th, 2019 AT 4:36 PM
Tiny
ASEMASTER6371
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You are welcome.

Roy
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Tuesday, December 10th, 2019 AT 4:44 PM

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