Skip the auto shop - Our mechanics make house calls

Q: My 1999 BMW blower comes on whenever I put keys in the switch and turn the motor on.

asked by on

My 1999 BMW blower of the AC or heater comes on whenever I put keys in the switch and turn the motor on.

My car has 270000 miles.
My car has an automatic transmission.

A: Hi there, thanks for writing in. If this co...

Hi there, thanks for writing in. If this comes on right when the car is turned on, then most of the time it is caused by a bad blower resistor module. This module fails internally and causes this to occur. I usually test the module first to see if it has failed as it can also be the fan control from the HVAC module. If you want to have this blower motor problem fixed, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair this.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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

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: after changing battery in car key wont turn in ignition

Try moving the steering wheel back and forth while turning the key. You should try this before continuing on to anything. If key still does not turn then you should try another key. The ignition should turn if it was...

Q: Transmission pops out of gear

Your car has an electronically controlled transmission. The strange behavior may be due to a bad switch on the column, or there may be some reason why the program doesn't want it to shift into Drive or Reverse. Maybe it's...

Q: Heater and fan not working

Hello. There are several things that could cause that heater to not work properly and the fan to only blow air on high. It is possible that you have a bad thermostat, which would cause the lack of heat. It...

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...