Q: Car loses some engine power when the blower is turned on.

asked by on

While driving down the interstate I had a loud belt squeal. When that happened I turned off the radio and my heat. When I turned the fan off I had full acceleration. I turned the fan to low and it had a light sqeek and some off of acceleration. At highway speed I was about 3000 rpms.

My car has 112114 miles.
My car has a manual transmission.

A minor loss of power when the fan is engaged is probably due to the air conditioning compressor. When the air conditioning, or the heater, is switched on, it activates the compressor. The light squeal is most likely coming from the compressor clutch being engaged when the system is activated, and the actual squeal could be coming from either the belt, or the clutch itself. As with all engine driven compressors, they will rob a small amount of power from the engine. This is why you will typically see a decline in fuel economy when either the heater, or air conditioner, is being used. If the noise, or power loss, seem excessive, you may want to have a certified mechanic, like those available at YourMechanic.com, take a look at the compressor and clutch assembly to be sure there is not an issue that is beginning to show itself.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
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. Car loses some engine power when the blower is turned on.

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: Q: White smoke comes out of Tailpipe.

The combustion process gives off a small amount of water, so the white smoke could be from condensation in hot exhaust gases, particularly in cold weather. In extreme cases, a head gasket rupture causes coolant to leak into the engine...

Q: I have a 2008 chevy impala ltz, it won't shift out of park and it won't start. the car reads that it is in first gear

It sounds like you may have a problem with the transmission with the transmission position sensor switch that may be preventing the vehicle from starting or the engine may only start when in gear or in neutral. I would suggest...

Q: Q: AC only blowing out hot air

Generally a bad tensioner will make noise at all times when the engine is running. If the noise only happens when the AC is turned on then the compressor is at fault. The use of an engine stethoscope can help...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...