Q: Front A/C blower motor working incorrectly.

asked by on

Blower motor will sometimes not run at all or will change speeds in real time no matter what the fan switch setting is at. The back system operates correctly and the air temperature is cold for both front and back systems. I don't believe it is a resistor problem or the blower would run on high speed no matter what the switch setting. The blower relay switch seems to function normally under the hood. There are no strange sounds coming from the blower motor when it does run. The connection to the blower motor appears to be tight. I am unsure if the problem is related to the blower control module ($150) or the control head ($600).

My car has 100000 miles.
My car has an automatic transmission.

One sure way to rule out the blower motor itself would be to observe voltage while the issue is happening. If the voltage being fed to the blower motor fluctuates, the problem is on the control side of the circuit and possibly the resistor. Hire one of our mobile experts to swing by and test the electrical system and track down this bug.

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. Front A/C blower motor working incorrectly.

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: Q: should i have transmission fluid changed

Hello. I can understand your concerns with servicing the transmission at this point. Since the transmission has never been serviced you do run the risk of causing some issues to start prematurely. With that being said, you should have it...

Q: Car has electrical problems and starting issues

My guess is that the problem is with the body control module (BCM). The BCM functions as the power mode master (PMM). In this role, it receives an input from the ignition switch when the key is turned to the...

Q: Opinion about older AC systems versus the AC systems in modern cars

Here is the kicker. The old air conditioning systems were huge and they wasted a lot of energy. But with that said, they blew as cool as can be and lasted a long time. For example, you can take...

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...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...