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A/C switch causes motor to rev up

Tiny
TONYJR84
  • MEMBER
  • 1995 MITSUBISHI GALANT
  • 106,000 MILES
Can rev up and turn a/c off and it runs normal. Which sometimes if airs on and it starts revving up and down I have to turn blower switch to high for it to stop. Can u tell me exactly what part I need to fix my little car? I can get an a/c switch ordered tomorrow but dont know exactly what I need
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Saturday, October 19th, 2013 AT 8:06 PM

4 Replies

Tiny
TY ANDERSON
  • MECHANIC
  • 684 POSTS
What motor are you talking about engine or blower motor? Is the engine reving up and down or is the blower motor reving? I just need more specifics. Let me know
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Saturday, October 19th, 2013 AT 8:33 PM
Tiny
TONYJR84
  • MEMBER
  • 2 POSTS
Sorry! It's the engine. 2.4 litre.
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Saturday, October 19th, 2013 AT 9:14 PM
Tiny
TY ANDERSON
  • MECHANIC
  • 684 POSTS
You may have a charging system issue. Most retail auto parts suppliers will test the charging system for free so have it tested.
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Tuesday, October 22nd, 2013 AT 9:23 AM
Tiny
TY ANDERSON
  • MECHANIC
  • 684 POSTS
It is normal for the engine RPMs to increase when the a/c is switched on. The a/c compressor adds a extra load on the engine so the the RPMs or engine speed increases to meet the demand of the compressor.
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Tuesday, October 22nd, 2013 AT 9:26 AM

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