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Engine pulley stopping and starting while idling

Tiny
DEREKREID1980
  • MEMBER
  • 2014 SUBARU CROSSTREK
  • 2.0L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 34,000 MILES
There is one pulley on the belt drive that starts and stops sporadically. At times it goes backward and makes a clunking noise when it starts or stops. Is this normal?
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Sunday, February 10th, 2019 AT 9:57 PM

3 Replies

Tiny
MPNANTO
  • MECHANIC
  • 17 POSTS
Hi Derek,

Thanks for visiting 2CarPros.

What you are looking at is your A/C clutch, it is normal for it to start and stop. The backwards rotation is also normal. The clutch engages to allow the compressor to spin this is what moves the refrigerant through your A/C system. When the A/C is not on the clutch disengages allowing the pulley to spin without moving the refrigerant through the system.

The backwards turn is the high and low sides equalizing. Once the clutch disengages the valve closes and the compressor vanes are pulled.
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Sunday, February 10th, 2019 AT 10:29 PM
Tiny
DEREKREID1980
  • MEMBER
  • 2 POSTS
Thank you very much. I just bought it today and was worried it was something serious.
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Sunday, February 10th, 2019 AT 10:36 PM
Tiny
MPNANTO
  • MECHANIC
  • 17 POSTS
You are welcome!

Thanks for letting us help.
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Sunday, February 10th, 2019 AT 10:38 PM

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