Q: Heater / A/C are not working properly. They are weak and the highest and lowest settings do not work at all. Any ideas what it could be?

asked by on

When I bought the car 3 years ago the level 1 heat/AC did not work, as long as I have had the car it has never worked. Approximately a year ago I had the water pump and timing replace. A couple of days ago I started my car and had absolutely no heat, the car would not blow any air out at all. I replace the fuse (hoping for a cheap and easy fix). After replacing the fuse the second and third level of air now work but blow out significantly weaker than in the past. The first level still does not work (and o don't honestly care about that) nor does the forth/highest level (blows absolutely nothing as if i turned the air completely off. I have tried resetting fuses heat and a/c, coolant is full but a bit cloudy. I was thinking maybe it is the blower resistor but if that were it it should work on high and not the other setting I thought.. I am hoping for another opinion, I would like to fix the problem withought guessing and fixing 1200 things. Any ideas what it could be? Thank you!!!!

My car has 170000 miles.
My car has an automatic transmission.

Hi there. Check the power from the switch on each setting and to the blower. See what the voltage is at each setting. If the voltage is low or not showing, then the switch is not working and needs replaced. The switch has a resister built in it to make the blower have different voltage outputs which makes the blower have multiple speeds. However, the first setting and the last setting could have a burned element inside making only the second and third setting work. Once you have the blower working properly, if there is no heat, then check the heater control valve in the engine compartment for if the vacuum line has came off or if the valve is not working. When the engine is at operating temperature, check the temperature of the coolant hoses to the valve and after the valve. If the hoses are the same temperature and the valve is shut, then the valve is on or not working. If the temperatures are different, then the valve is off or not working. If you need further assistance with your heater and a/c not working, then seek out a professional, such as one from Your Mechanic, to help you.

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. Heater / A/C are not working properly. They are weak and the highest and lowest settings do not work at all. Any ideas what it could be?

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 is ticking louder after spark plug replace

It is possible that the spark plugs were not correct that were installed in your vehicle and not could be causing the spark to be insufficient. I would recommend confirming that you installed the correct part number spark plug on...

Q: Only get heat when i rev up my car or push the gas. Other tham that i only get cold air coming out.

You may have a clogged heater core that may be prohibiting the outer linings of the heater core to get hot. As you know, the heater core is a series of tubes that the coolant runs through that generates the...

Q: Why do car rpms bounce when I put it in drive?

This may be a sign of a dirty or failing mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected...

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...
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...
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.