Q: heating/cooling sysytem

asked by on

Back a couple months ago my motor blew so I got a new motor and resistor for my car thinking that would fix the heating/cooling problem but it didnt so what could be the problem ?

In the future, it helps if you include your car’s year, make, and model. On all cars there are a few few other components involved in the blower motor circuit on your car.

Blower motor switch: This can be in the form of a automated module that controls the temperature, mode and blower speed. This type of system would be found on luxury cars. It can also be a simple four position switch. There are a few other configurations that are a combination of the two, but in every case, there is a switch, either automated or manually controlled that will send power to the resistor that controls fan speed.

Whenever we are testing an electrical circuit, the first thing that should be done is check all the fuses. Not just the fuses in the circuit, gut all the fuses. It is often difficult to know if another fuse powers a part of the circuit you are working on, even when it isn’t labeled as such. The simplest thing to do is to test all the fuses. If you find a blown fuse, you will need a factory wiring diagram to determine what it supplies power to.

Connectors commonly get hot and melt in this system. If you find a connector at the resistor, blower motor or blower motor switch, (keep in mind the switch could be a module, I don’t know because I don’t know what kind of car you have) that has been hot or melted, this will create a high resistance in the circuit and electricity won’t flow. Even if the connection looks good to the human eye, electricity doesn’t flow based on what we thing we see. The flow of electricity occurs at the atomic level.

If you decide to get this fixed I suggest getting your car looked at by a certified technician, such as one from YourMechanic, who can diagnose your A/C issue and make the necessary repairs.

I hope this is helpful to you.

Good luck!

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. heating/cooling sysytem

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: How long does it take to install a block heater?

Hi there. Installing a block heater for your vehicle depends on what type of heater you are installing. Some heaters are externally mounted to the bottom of the engine oil pan and other heaters are inside the engine oil pan....

Q: Engine vibrates when aircon is on and vibration increases specifically in traffic

Hey there. The "vibration that goes on and off" is likely the compressor cycling on and off - this is by design. However, the fact that this seems to have a pounding noise with it, is most not common for...

Q: Q: A fuse blows when power seats are used

The power seat motors on your 2004 Kia Amanti have only one fuse, and it is a 30 amp fuse. If you replace this fuse, and it blows when you try and operate the seat then there is a problem...

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...
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...
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.