# C230 MBenz 1998

**URL:** <https://community.cartalk.com/t/c230-mbenz-1998/32751>\
**Category:** Maintenance/Repairs\
**Created:** [July 2, 2009, 1:54am UTC](https://community.cartalk.com/t/c230-mbenz-1998/32751 "2009-07-02T01:54:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![terrylove](https://avatars.discourse-cdn.com/v4/letter/t/85e7bf/32.png) [@terrylove](https://community.cartalk.com/u/terrylove)\
**Post date:** [July 2, 2009, 1:54am UTC](https://community.cartalk.com/t/c230-mbenz-1998/32751/1 "2009-07-02T01:54:00Z")

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Sporatically, the A/C will put out intense heat at the driver’s side vent. +Sometimes the passenger’s side vent. + sometimes the floor vent. Computer diagnostics have not uncovered the problem.  
  
 During this time, the A/C will not turn off.  
  
  
  
 Love your show. Thanks.

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<div class="post-metadata">

**Author:** ![Baxter\_s\_Dad](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/baxter_s_dad/32/27_2.png) [@Baxter\_s\_Dad](https://community.cartalk.com/u/Baxter_s_Dad)\
**Post date:** [July 2, 2009, 4:28am UTC](https://community.cartalk.com/t/c230-mbenz-1998/32751/2 "2009-07-02T04:28:40Z")

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The problem you describe occurs when the AC is on and shoots  
frigid air to the in-cabin temp sensor (located in the dome light  
assembly in W201s - I expect it’s there in a W202 as well). So the  
sensor thinks the temp is too cold, so adds heat to the equation, but  
only cold air can emerge from the center vents (by design) so you get  
hot air from the sides and cold from the center that continues to cool  
the in-cabin sensor and keep the warm air coming out of the side vents.  
Closing or redirecting the center vents can usually manage to control  
the problem.