Skip the auto shop - Our mechanics make house calls

Q: Heat/AC blower turns off and on

asked by on

Blower intermittent. Shuts off when button on and turns on when button off. Has even stayed on after car is,shut down and keys removed from ignition. Heat and AC are OK. It is just the fan/Blower. I was told it's probably a switch loose. How can I have this properly diagnosed and repaired,

My car has 130000 miles.

A: Hi there. Check the switch for any loose w...

Hi there. Check the switch for any loose wires or shorts from the blower motor switch to the ignition switch. Check the condition of the wire connections for an corrosion and see if the wires are loose on the ground. If you need further assistance troubleshooting your vehicle, then consult with a certified technician from YourMechanic, to diagnose the heater/ac and move forward with repairs.

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!

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: Tires losing air

If you have chrome plated wheels, corrosion can build up much easier on chrome plates than steel wheel or alloy wheels. Corrosion is also common on alloy wheels. A puncture in the sidewall of a tire is non repairable unless...

Q: Warm air blowing out of vents. It's not hot like it should be and it takes a very long time to get warm

Hi, thanks for writing in. Generally speaking, if a vehicle is taking a long time to get to operating temperature you have a thermostat that is stuck open. You can replace it and it will fix your problem. Also, if...

Q: Brand new motor will not start

Hi there. From the description you have provided, changing the vehicle engine, shorting the alternator and now a no start, is going to require proper diagnoses. The computer recognizing a fault in the auto shutdown relay circuit, is encouraging, the...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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.