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 informati...

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.

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: Transmission leak stuck choppy - 2005 Mercedes Benz C55 AMG

Hello. From the symptoms you describe, it would appear that the vehicle is experiencing issues that have put it into limp, power reduction mode. If the TCU requires replacement, it can usually be found in the engine bay on the...

Q: 2007 Mercedes-Benz S550 stalls and then turns itself off

If you start the 2007 Mercedes-Benz S550 using the keyless go system and the vehicle is acting erratic, then it may be due to this module being erratic from the battery voltage dropping below a certain level and causing it...

Q: AC running but not blowing.

When your heater control valve fails, this can cause the vehicle to heat one side and not the other on a dual zone system. I would recommend having your heater control valve tested using the manufacturer's recommended procedure to ensure...

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...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...