Skip the auto shop - Our mechanics make house calls

Q: AC/heat suddenly stopped working

asked by on

My AC/heat just stopped working. No are is blowing out at all from either setting what could it be?

My car has 53000 miles.
My car has an automatic transmission.

If no air hot or cold is blowing from the vents, there are a couple of possible causes. Air is moved through the heating and air conditioning system by the blower motor. Typically the blower motor is located on the passenger side behind or under the dash and covered by trim panels. The blower motor itself operates on different speeds by using s resistor which varies voltage to the motor itself to vary speed. Less voltage means slower blower motor speeds. Higher voltage means higher blower motor speeds. Typically blower motor resistors show signs of failure with certain blower speeds not working. For example, the blower bay work on speeds 1,2,and 4, but not on 3. It is possible however, for the resistor to fail entirely and provide zero voltage to the blower motor no matter the speed settings. Also, the blower motor itself can fail to operate no matter whether the resistor is providing voltage at every speed setting or not. Also, it could simply be a blown fuse or bad relay not sending any power at all to the resistor or motor. Have a certified technician inspect your heating and air conditioning system to find the correct fault.

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: Charged air conditioner stopped working

You are very likely having a refrigerant leak. Look for oil around the lines or the connections to the AC system. Compressors are the most common source of leaking. There are many other potential causes. You typically want to add...

Q: i 20 elite sportz diesel i want to replace my car wheels with alloy wheels.Present wheel dimensions 185/70R14.

As long as you get the same size rim, you should be fine. Check on the factory rim to see if a size is stamped somewhere. It is usually on the inside of the rim so you may need to...

Q: my car trunk opens on its own when i turn off the car, only and only when i turn off the car every time, kia optima 2012

Try to take out the battery on your key FOB to see if the trunk still opens when you turn off the car? You may also want to check the key FOB for a stuck trunk button. If problem goes...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
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...