Q: My engine fan turns off wen ac is on why is that

asked by on

My 2003 Chevy avalanche has a problem wen I turn my AC on my engine fan turns of why is that

My car has 100000 miles.
My car has an automatic transmission.

Your engine fan is a mechanical fan driven by the engine crankshaft damper. If the damper is broken then the crankshaft may turn and not turn the serpentine belts. When you turn on the A/C it puts pressure on the belt, causing it to stop turning. Have the crankshaft damper checked to see if the rubber is broken. If you have an electrical fan instead of the mechanical fan then you may have a bad relay or A/C cycling switch that needs to be tested. If you need some assistance with this, feel free to contact a certified technician who can diagnose the issue with your A/C and fix it accordingly. Good luck.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My engine fan turns off wen ac is on why is that

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Engine choking, ABS and ASR lights illuminated - 1993 Mercedes-Benz 300SE

Hello. If all of these occurred at the same time then the battery and alternator need to be checked. If the alternator is not charging or if the battery is bad then this will occur. If that is fine then...

Q: My Mercury Mountaineer 2003 will not start.

Hello, thank you for writing in. What sensor was unplugged when you started the vehicle? You will want to consider this sensor and the different systems that it may provide information to. Without that information the computer may have shut...

Q: Q: Cold Starting Problems

Cold starting in the mornings, especially when cold is difficult for any engine as the engine will require much more fuel than normal during a cold start. When you start your car in the morning and turn the key to...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.