# 92 gmc Sububran A/C clutch

**URL:** <https://community.cartalk.com/t/92-gmc-sububran-a-c-clutch/34402>\
**Category:** Maintenance/Repairs\
**Tags:** suburban, gmc\
**Created:** [August 2, 2009, 7:25pm UTC](https://community.cartalk.com/t/92-gmc-sububran-a-c-clutch/34402 "2009-08-02T19:25:42Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![jeep98](https://avatars.discourse-cdn.com/v4/letter/j/8edcca/32.png) [@jeep98](https://community.cartalk.com/u/jeep98)\
**Post date:** [August 2, 2009, 7:25pm UTC](https://community.cartalk.com/t/92-gmc-sububran-a-c-clutch/34402/1 "2009-08-02T19:25:42Z")

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I have a 1992 GMC Suburban with an A/C problem.  
  
  
  
 The clutch does not work correctly. It does not turn when the A/C button is pushed.  
  
  
  
 I unplugged the wire harness and jumped it from the battery , the clutch kicks on.  
  
  
  
 So I know the clutch is OK.  
  
  
  
 Is there sensor somewhere that it bad, does any one have a wire diagram for the A/C system thanks.

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [August 2, 2009, 7:28pm UTC](https://community.cartalk.com/t/92-gmc-sububran-a-c-clutch/34402/2 "2009-08-02T19:28:58Z")

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The AC system may be low on refrigerant charge. If it is, there’s a low pressure switch in the system that prevents the compressor clutch from engaging so the compressor isn’t damage from the low refrigerant charge.

Tester

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**Author:** ![budd2049](https://avatars.discourse-cdn.com/v4/letter/b/77aa72/32.png) [@budd2049](https://community.cartalk.com/u/budd2049)\
**Post date:** [August 2, 2009, 8:26pm UTC](https://community.cartalk.com/t/92-gmc-sububran-a-c-clutch/34402/3 "2009-08-02T20:26:43Z")

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Like Tester said, this is most likely due to a loss of refrigerant. There’s a surefire way to check if the clutch is operating.

Locate the receiver/drier (silver cylinder mounted on the passenger side firewall). There should be a two-wire plug hooked to this. Unhook the connector, short the contacts on the connector together (a paper clip works well), and turn the A/C on. The clutch should engage and operate the compressor.

If this works, then you are low on refrigerant and have a leak somewhere.

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**Author:** ![missileman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/missileman/32/1366_2.png) [@missileman](https://community.cartalk.com/u/missileman)\
**Post date:** [August 2, 2009, 9:56pm UTC](https://community.cartalk.com/t/92-gmc-sububran-a-c-clutch/34402/4 "2009-08-02T21:56:17Z")

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You probably need a system recharge. Since you have a '92 model you need to get it retrofitted to R134a.

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**Author:** ![oldschool](https://avatars.discourse-cdn.com/v4/letter/o/e19adc/32.png) [@oldschool](https://community.cartalk.com/u/oldschool)\
**Post date:** [August 2, 2009, 11:25pm UTC](https://community.cartalk.com/t/92-gmc-sububran-a-c-clutch/34402/5 "2009-08-02T23:25:23Z")

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On a orfice tube system (like GM uses) the silver bottle thingy is called a accumulator. You can jump the switch as advised.