Q: The air conditioning, heater, and defroster are not working.

asked by on

Hi there,

After a longer drive in cold weather and higher altitude it seems my ac/heater/defroster are not blowing. If I attempt to turn them on I experience a few things:

1)A "gurgling" noise coming out of the center vents regardless of what vents I turn on. 2) I can feel the slightest amount of cold air with the AC on. But no hot air with the heater on. 3)I also notice the performance decrease when I turn it on.

Other than that I do not have too much information. Other than it does not matter what option I select it doe not blow.

Thanks! Nicholas

My car has 88000 miles.
My car has an automatic transmission.

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. The air conditioning, heater, and defroster are not 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: I put in regular unleadead by mistake my car takes premium

Your vehicle will start and run well on both regular and premium fuel unleaded. Premium fuel is stated as "required" by Mercedes Benz simply because premium will maximize the performance, fuel economy, and possibly service life of the engine. But,...

Q: How do you turn on the rear defogger and heated mirrors?

Your car is equipped with both a front and rear defogger. The front defogger is tied into your air conditioning system, but the one in the back is different (and uses a different control). If your car is also equipped...

Q: How do I use the rear seat warmers?

The rear seat warmers are controlled by the Rear Seat warmer switches, which are on the inside of both rear doors. To use a rear seat warmer, press the corresponding switch. Press the switch again to turn off the warmers....

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...