Q: Air conditioning started blowing hot air

asked by on February 01, 2016

The air conditioning was working fine. Then is suddenly started blowing hot air. Do I need a new air conditioner compressor?

AC is not working Inspection $96.46 - $106.46 Get a Quote

There are many components that allow the air conditioner in your Mercedes to blow ice cold on days when you need it the most, but without a bit more information it is difficult to determine if the A/C compressor is in need of replacement. The A/C will blow hot if the system has developed a leak, such as when a rock or road debris makes its way beyond the grill on your bumper, causing damage to the A/C condenser. It is also possible that one of the blend doors that allow you to switch from hot to cold air has failed and is only providing hot air. To be certain what is causing your A/C to emit only hot air, it may be time to enlist the assistance of a certified mechanic. They will be able to determine why your A/C is not operating and perform the necessary repairs to keep the car cool on those hot days.

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

What others are asking

Hello, I have a 2010 Mercedes c300. Lately each time I put gas the car won’t start until I keep pushing gas pedal. Code p2422

The codes (P0174, P0171) indicate insufficient fuel relative to the air charge (i.e., lean operation). Lean operation can be caused by a faulty fuel pressure regulator, a weak fuel pump, a clogged fuel filter, a faulty powertrain control module (not...

I lost my key to my Pontiac Grand Prix 2003. It will start without the key, but shuts off after 30 sec - is this because i don't have the key?

Hey there. Your vehicle is equipped with what GM calls their VATS system (vehicle anti-theft system). There is an electronic chip embedded in the ignition key and a "chip reader" that is part of the ignition switch. The reader looks...

I have a Ford Focus the car is jerking and engine light turns on but turns off when I shut the car off

A couple of things may cause this to happen such as a faulty cam position sensor a transmission problem or in some cases a dirty or faulty idle air control valve. The camshaft position sensor is a magnetic sensor that...

Car cutting out when slowing down

This may be related to a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at...

How much for a head gasket replacement job?

Hi There, It sounds like you may be correct in that this is a classic sign of a blown head gasket. A blown head gasket may cause a number of different symptoms. Coolant in the engine oil, an engine misfire...

Car will not shift into fourth gear - 1991 Mercedes-Benz 300SE

Hello. I would check the condition of the transmission fluid first as well as the level. If the fluid is old or low then this will occur. If the fluid smells burnt or has debris in it then the transmission...

Sensitive Car Alarm

It sounds like you ma possibly have a weak battery or a problem with the alarm system itself. Generally, accessories like alarms will inadvertently set off by themselves when the battery is weak. I would suggest having a professional from...

Ignition fuse keeps blowing

You had a good start by tracing the wires and making sure they were clean, dry, and not damaged. To make sure you covered the entire circuit, I recommend you use an official wiring diagram to check this. It is...

Can't keep antifreeze in car

If your vehicle is losing coolant (antifreeze) you probably have a leak. I recommend having a trained technician, like one from YourMechanic, pressure test your cooling system to locate where the coolant is leaking from. From there, they will be...

Related articles

Top Automotive News & Stories: September 24-September 30
Angry Civic Type R, 350 special edition Ferraris, Infiniti variable compression tech, Mercedes' electric future, and more.
What Sensors in the AC Tell the Car If the System Is Working or Not?
The The average car today contains a bewildering range of sensors that feed information to various computers to monitor everything from air intake to emissions and engine timing. Your car’s air conditioning system also contains a couple of sensors that...
Why Does My AC Rattle When I Turn It On?
Common reasons why a car AC system makes a rattling noise is due to a failing AC compressor, worn serpentine belt, or worn out AC compressor clutch.