Skip the auto shop - Our mechanics make house calls

Q: Heating system suddenly quit working

asked by on

Heating system suddenly quit working.The whole ac/heating sytem will not come on

My car has 125000 miles.
My car has an automatic transmission.

A: This may be related to a faulty blower moto...

This may be related to a faulty blower motor or blower motor relay. The blower motor is a unit inside your vent system that blows warm air from the heater core to the vents when the heater is on or cool air from the air conditioning system when the A/C is on. There is a blower motor relay that supplies power to this motor when you turn the switch to "on" that can sometimes fail. When this happens, you may notice that you will not feel anything blowing out of the vents at all. There is also a blower motor resistor that controls the various speeds and functions of the blower motor once it is turned on. I would recommend having an expert from YourMechanic come to your location to diagnose your blower motor and vent system.

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・Save up to 30%

Get a quote

What others are asking

Q: Shifter cable

The short answer to your question would be yes. The reason is because if the shifter cable is loose, this can prevent the vehicles computer system from acknowledging that the vehicle is actually in park. This can cause the vehicle...

Q: Rear Brake light and turn signal not working on driver side

Lighting problems like this can seem very confusing, so it is best to start with the basics. Check for power and ground at the turn and brake light sockets. I suspect in your case you will have a good ground...

Q: Truck hesitating down the highway

With the floor board getting hot during the drive, you may want to look underneath the truck and see if the catalytic convertor is located roughly in the area where the heat is coming from. It sounds to me like...

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...
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...
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.