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.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • Home
  • Questions
  • My 1999 BMW blower comes on whenever I put keys in the switch and turn the motor 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: P0170 and P0173, I have changed the MAF and Both sensors. Now my car does not start.

P0170 and 173 indicate that your fuel mixture is off. The ECU tries to compensate, but the error is so large that it cant make the correction. It can be caused by a Mass Air Flow sensor, but there could...

Q: Car headlight has low beam problem

Hello. Depending on the type of head lamp system your car has, this could be as simple as a burned out head lamp bulb. If you have a standard halogen headlamp, it is probably just a burned out bulb. Now...

Q: Heater blows cold

In very cold weather a vehicle may need more time to heat up before hand to help start the car efficiently. In some cases old or low coolant levels can affect the ability your vehicle has to produce sufficient heat....

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.