Skip the auto shop - Our mechanics make house calls

Q: Auto climate control

asked by on

having problems with auto ac, air will be on then randomly turn off, after adjusting temp auto air might randomly blow warm air then cold, as if not sure what the correct temp is in the car. Is there a interior temp sensor that fails in this model/car?

My car has 99000 miles.
My car has an automatic transmission.

A: Even without having specified what model Me...

Even without having specified what model Mercedes, yes they do use in car temperature sensors. Your issue can be related to the in-car temperature sensor or the climate control unit itself. Since Mercedes climate control systems are known for their complexity - even the old vacuum-operated systems in the two 1983 300SD's I previously owned in recent years were "fun" to work on - I suggest having the system properly diagnosed before simply changing parts as that can cost you more in time and money than having a proper answer from the start. One of our mobile technicians can come to your home or office and diagnose your air conditioning issue firsthand if you'd like to get this fixed.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Can Cold Weather Crack Your Car Windows or Windshield?

When considering if cold weather can crack your windows or windshield, it is important to first note that glass windows are under tension. As with any material, glass is subject to stress through expansion, and compression or contraction with...

Q: AC Repair

Thank you for your question and I am sorry to hear of this problem in particular, as we all know that driving a car without A/C in the summer is about equivalent to what coal trimmers endured feeding coal into...

Q: Temperature gauge not reaching appropriate temperature.

When replacing thermostats, or if you are trying to diagnose a problem, the best thing to do is install the OEM (i.e., dealer supplied) thermostat. Assuming that the thermostat you got is "good" (i.e., opening at OEM specified temperature and...

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...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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.