Q: My 2013 Mercedes benz c250 ac won't work, it blows hot air and the ac button light flashes red three times and then turns of

asked by on July 26, 2017

The ac was working fine but just like about a week ago it seemed to stop working. It would only turn on sometimes and other times it would blow hot air out. Whenever it stops working I try to turn it on again and the ac button light flashes 3 times before turning if completely.

My car has 56000 miles.
My car has an automatic transmission.

Hello. On this vehicle for it to be acting up like this it typically means that there is a programming issue with the HVAC unit. It is also possible that the system has a small leak if it has been in an accident, but it will more than likely just need programming. This would need to be done at the dealer.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $65/hr

What others are asking

hi. 2002 mb c240. light came on for visit shop battery/alternator. Battery is new. how to know if alternator is bad?

Hello, thank you for writing in. The alternator can be tested by checking the voltage coming from it while it is running with a voltmeter. You should also check the voltage when revving the engine to 2000 RPMs. The alternator...

Frequent flickering of interior / dash board lights.

Your car has about a dozen modules spread around the body that control various functions. I have dealt with a similar problem in the past and eventually found a connector on one of the SAM's (signal acquisition modules) that was...

How long for an AC compressor repair?

Hey there. The replacement would take the average technician about 2 hours of labor to perform this task after evacuating the system of refrigerant to make sure it is not released into the atmosphere. If you do not have the...

Have full power steering and car still makes whining noise when I turn the wheel. Just got the car like 6 months ago.

If you are getting a whining noise from the power steering then the noise may be from the power steering pump internal vanes which are worn. This will cause the pump to not apply enough pressure at low vehicle speeds...

AC not cooling.

Most of the time when the AC stops working, it is because of a leak. The refrigerant system is a sealed system that is under pressure. If the pressure sensors detect the system is low, it will keep the compressor...

Sunroof stuck open

Hi there. A jammed sunroof is caused usually because of gathered dirt along the track obstructing the sliding of the sunroof. Another possible issue can be that your sunroof motor has weakened over usage. You can have a certified mechanic,...

Car will not start - 2010 Mercedes E550

Hi there. The job of the starter relay and the fuse that supplies power to it, is to activate the starter motor to spin when the ignition circuit has been activated. Since you've hooked up a battery (by attempting to...

Why does my 2013 ford fusion keep shutting off

Hello there, many different faults will cause your 2013 Ford Fusion to stall and shake. The most likely causes are the spark plugs, fuel pump, coils, wiring harness fault, vacuum leak, or oxygen sensors. This vehicle needs diagnosed fully to...

My acceleration is very poor

This can happen for a variety of reasons, however what is most commonly associated with the symptoms you describe is a faulty throttle position sensor. This is a unit that monitors the position of your foot on the gas pedal...

Related articles

How to Buy a Good Quality Thermostat
While While many people are familiar with the major parts in their vehicle, there are all kinds of smaller parts that play a vital role as well. The thermostat is one of those parts that many don't think about, but...
Top 10 Factors to Consider When Buying a Luxury Car
The The idea of owning a luxury car is appealing. The glossy paint, swoopy lines, and prestigious badges speak of the owner’s success in life, while the interior opulence offers scented leather surfaces, high-tech telematic devices, and all the creature-comfort...
How a Car's Heating System Works
The The sun sets, and the air has a chill. You pause to flip your jacket collar up, and you walk briskly to your car door and slide into the driver's seat. Once you start your car, it’s only moments...