Skip the auto shop - Our mechanics make house calls

Q: A/C cooling fan only starts working at 93 degrees

asked by on

The cooling fan in A/C doesn’t start to work until the temperature reaches about 93 degrees. That doesn’t seem normal to me. I didn’t find any water leakages, but the coolant box is still decreasing water. Another problem is when I park the car, after driving around in town, the water waste pipe throws out water. But on the interstate highway, it works fine. What is causing these problem?

A: There doesn’t seem to be past information o...

There doesn’t seem to be past information on the A/C not turning on until 93 degrees for a 2011 Mercedes Benz S550. I would try to see if the automatic temperature control is set to automatic and dial temperature to 65 degrees. The blower and A/C should come on high blower speeds and get cool quick. If not, then you may have a problem with ambient temperature sensor. The coolant leak may be due to the radiator cap not holding the correct pressure or overfilling the coolant reservoir. Your best bet may be to have a trained mechanic inspect the AC system in person and recommend the appropriate repairs.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Can my seat belt pretensioner be repaired, or does it need to be replaced?

Most vehicle manufacturers are very particular about most of their components, but when it comes to supplemental restraint systems (SRSs), such as air bags, pretensioners, and so on, they are most particular. While it has been some time since I've...

Q: I am thinking of buying a 2010 S550 with about 57,000 miles. What's your advice prior to buying?

You have three very nice choices in front of you and I am sure you know of the amazing reputation Mercedes has with respect to these particular models. The AMG model comes with slightly more horsepower and a bit more...

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...

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...
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.