Q: My car won't reach full fan speed

asked by on

Hey there, having problems not reaching full fan speed on my 2007 GMC Sierra. On the display it gets every fan speed but the high speed one. Just wondering if you guys think it's the blower motor resistor or what it might be?

My car has 130000 miles.
My car has an automatic transmission.

Hello. A failed blower motor resistor will cause certain fan settings to fail. In fact this is the most likely cause for your symptoms. Accessing the motor can be the hardest part. You will want step by step guides to help you if attempting to DIY. Once you can visually inspect the resistor, you may find burn marks, or other types of deposits or damages. The only other typical malfunction that would cause this would be a switch malfunction. Even still, those chances are smaller. If you’d like assistance with this, consider having a certified technician, such as one from YourMechanic, diagnose the issue with your fan speed and help you make the necessary repairs.

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
  1. Home
  2. Questions
  3. My car won't reach full fan speed

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: The Check Engine light flashes when I go to give it bunch gas and feels like it misfires 2002 Chevrolet Silverado 1500

Hello - first task is to retrieve whatever problem codes are tripping the Check Engine light. Most auto parts stores will do that for you for free. Without that info, I suspect you have a weak spark plug or ignition...

Q: Blower motor resistor melted, replaced it turned on blower motor and it melted again in seconds.

The blower motor that is drawing too many amperes will melt the resistor and wiring. Anytime the resistor is melted you should replace the blower along with the resistor and connections that show any heat damage. If you need assistance...

Q: Diesel truck broke down. No steering or brakes.

I believe that the towing company is correct. Heavy duty trucks get their power brakes hydraulically instead of a vacuum booster like passenger cars. Heavy duty trucks actually get their assist from the power steering pump fluid. So, if your...

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.