Q: I have a mazda 1998 protege dx when i turn on the ac the car starts to shake alot but when i turn off the ac it runs normal .....

asked by on August 30, 2017

I have a mazda 1998 protege when i turn the a.c. the car starts shakes a lot but when i turn off the a.c. it runs normal and and sometimes it losses power need help thanks

My car has 244011 miles.
My car has an automatic transmission.

Hi Omar. Thanks for contacting us today. Shaking with the a/c on can be caused by a number of reasons. The a/c compressor puts a lot of strain on the engine because the compressor is similar to being a small engine itself. When the a/c is switched on, the engine control unit should trigger components such as the idle speed/air control motor, to increase the idle slightly to compensate for the extra drag of the compressor. If that does not happen, then the additional drag can cause a low,shaky idle and even cause the engine to stall. Since there are multiple fuel and ignition systems that could be faulty that cause this to happen, it’s best to have a professional mechanic complete an onsite inspection to determine what repairs are needed to resolve this issue.

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