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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. AC/heat suddenly stopped working

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: Car starts, dashboard lights flicker, air conditioning shuts off

Hello there, thank you for asking about your 1993 Isuzu Pickup. It sounds like a bad ground in the instrument panel circuit. Looking at the wiring diagram, I see the AC heater control panel and instrument cluster share the same...

Q: Car squeaking when first starting

If your car is squeaking on cold starts, then that is a sign that there may be a problem with one or more of the engine's belts, or pulleys. If a belt becomes excessively worn, it will eventually begin to...

Q: How do I turn auto door unlock off?

Auto door unlock is a feature that will set the doors to automatically unlock when you finish driving your vehicle. To turn this feature off, and only unlock the doors manually, follow these steps: 1. Engage the parking brake. 2....

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
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...