# Intermittent A/C

**URL:** <https://community.cartalk.com/t/intermittent-a-c/36244>\
**Category:** Maintenance/Repairs\
**Tags:** pontiac, lemans\
**Created:** [September 6, 2009, 11:07pm UTC](https://community.cartalk.com/t/intermittent-a-c/36244 "2009-09-06T23:07:02Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![tenthumbs](https://avatars.discourse-cdn.com/v4/letter/t/c2a13f/32.png) [@tenthumbs](https://community.cartalk.com/u/tenthumbs)\
**Post date:** [September 6, 2009, 11:07pm UTC](https://community.cartalk.com/t/intermittent-a-c/36244/1 "2009-09-06T23:07:02Z")

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My mum just had her Crank Sensor and Ignition Module replaced ('98 Pontiac LeMans w/ 55K miles) because the car was dieing suddenly. That may have fixed the dieing problem but since she got it back the A/C doesn’t come on for a varying period and then goes on and off. This applies to the fan as well as the compressor so it seems to me it is an electrical or electronic issue. I guess she should take it back to the guys who did the work but I was hoping maybe someone had experienced this before.  
  
  
  
 Thanks,  
  
 tenthumbs

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**Author:** ![BustedKnuckles](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bustedknuckles/32/25_2.png) [@BustedKnuckles](https://community.cartalk.com/u/BustedKnuckles)\
**Post date:** [September 7, 2009, 12:46am UTC](https://community.cartalk.com/t/intermittent-a-c/36244/2 "2009-09-07T00:46:50Z")

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You need to get the pressures checked. In 11 years, enough refrigerant may have leaked out causing pressures below the threshold of the low-side cutoff switch. This would cause the turning on and off.

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**Author:** ![tardis](https://avatars.discourse-cdn.com/v4/letter/t/f0a364/32.png) [@tardis](https://community.cartalk.com/u/tardis)\
**Post date:** [September 7, 2009, 1:29am UTC](https://community.cartalk.com/t/intermittent-a-c/36244/3 "2009-09-07T01:29:36Z")

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Low pressure wouldn’t turn the cabin fan off. The OP is right. It is an electrical problem.

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**Author:** ![tenthumbs](https://avatars.discourse-cdn.com/v4/letter/t/c2a13f/32.png) [@tenthumbs](https://community.cartalk.com/u/tenthumbs)\
**Post date:** [September 7, 2009, 4:36pm UTC](https://community.cartalk.com/t/intermittent-a-c/36244/4 "2009-09-07T16:36:52Z")

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The pressures were tested in '04 and coolant checked/added. When it is working it blows good cold air so that is why I think it is electrical. I’m thinking this might be something to take to the dealer rather than the independent she has been going to.