# Temperature Gauge and Air Conditioner don't work and the Check Engine Light Comes On

**URL:** <https://community.cartalk.com/t/temperature-gauge-and-air-conditioner-dont-work-and-the-check-engine-light-comes-on/46087>\
**Category:** Maintenance/Repairs\
**Tags:** ion, saturn\
**Created:** [March 14, 2010, 6:12pm UTC](https://community.cartalk.com/t/temperature-gauge-and-air-conditioner-dont-work-and-the-check-engine-light-comes-on/46087 "2010-03-14T18:12:50Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![otmy0023](https://avatars.discourse-cdn.com/v4/letter/o/e99b99/32.png) [@otmy0023](https://community.cartalk.com/u/otmy0023)\
**Post date:** [March 14, 2010, 6:12pm UTC](https://community.cartalk.com/t/temperature-gauge-and-air-conditioner-dont-work-and-the-check-engine-light-comes-on/46087/1 "2010-03-14T18:12:50Z")

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All three incidents occur together. Occasionally, the light turns off, and the temperature gauge and air conditioning go back to normal again. Any ideas on what could be causing this to happen, what the fix is, and how expensive it will be?  
  
  
  
 Thanks,  
  
 Chris

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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:** [March 14, 2010, 6:20pm UTC](https://community.cartalk.com/t/temperature-gauge-and-air-conditioner-dont-work-and-the-check-engine-light-comes-on/46087/2 "2010-03-14T18:20:07Z")

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No idea. Start with getting the codes read. They will be in the form like P0130. Most auto parts stores will read the codes for free. Post the code(s) here, and we can give much better advise.

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**Author:** ![circuitsmith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/circuitsmith/32/40376_2.png) [@circuitsmith](https://community.cartalk.com/u/circuitsmith)\
**Post date:** [March 14, 2010, 9:46pm UTC](https://community.cartalk.com/t/temperature-gauge-and-air-conditioner-dont-work-and-the-check-engine-light-comes-on/46087/3 "2010-03-14T21:46:00Z")

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Might be a loose or corroded connection on a line that supplies power or ground to the computer and part of the dash.

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**Author:** ![otmy0023](https://avatars.discourse-cdn.com/v4/letter/o/e99b99/32.png) [@otmy0023](https://community.cartalk.com/u/otmy0023)\
**Post date:** [March 15, 2010, 12:53am UTC](https://community.cartalk.com/t/temperature-gauge-and-air-conditioner-dont-work-and-the-check-engine-light-comes-on/46087/4 "2010-03-15T00:53:40Z")

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It is P0128, thanks for everyone’s help

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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:** [March 15, 2010, 1:11am UTC](https://community.cartalk.com/t/temperature-gauge-and-air-conditioner-dont-work-and-the-check-engine-light-comes-on/46087/5 "2010-03-15T01:11:53Z")

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There’s probably something wrong with your coolant temperature sensor, or the wiring going to it. The PCM may be turning the AC off as a self protection feature since it doesn’t know what your engine temperature really is.