a/c switch causes motor to rev up

1995 MITSUBISHI GALANT
106,000 MILES
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TONYJR84
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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
Oct 19, 2013 at 8:06 PM
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TY ANDERSON
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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
Oct 19, 2013 at 8:33 PM
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TONYJR84
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Sorry!! It's the engine. 2.4 litre.
Oct 19, 2013 at 9:14 PM
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TY ANDERSON
  • CERTIFIED EXPERT
  • 719 POSTS
You may have a charging system issue. Most retail auto parts suppliers will test the charging system for free so have it tested.
Oct 22, 2013 at 9:23 AM
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TY ANDERSON
  • CERTIFIED EXPERT
  • 719 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.
Oct 22, 2013 at 9:26 AM