Q: Air conditioner blows hot air. 1995 Mercedes-Benz E300

asked by on August 30, 2016

The air conditioner in my car is only blowing hot air. I have had to take it to the shop many times for this same A/C problem and no one seems to know how to fix it. It is usually in the hot temperatures when the air conditioner stops blowing cold air; however, when it is cooler temperatures outside it will blow cold air. Could you please tell me what is causing this so I can get it fixed? Thanks.

AC is not working Inspection $96.46 - $116.46 Get a Quote

Hi there, thanks for writing in about your 1995 Mercedes-Benz E550. This could be a variety of issues, such as no pressure or low refrigerant levels, a bad compressor clutch, or a compressor not engaging correctly. Check to see if the cooling fans are on when the AC is running. Most systems are designed to have them run when the AC is on. Also, check to be sure the compressor is engaged. Look to see if the pulley is spinning when the car is running with the AC on. If you need help with this, a qualified professional from YourMechanic can come to your car’s location to inspect the AC system and pinpoint the necessary repair.

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 $70/hr

What others are asking

Recently replaced ABS control module and when we went down the mountain on 40 towards Old Fort, it vibrated HORRIBLY.

The new module will need to be programmed with the vehicle it is installed on. The vibration is from the anti lock brakes activating when they should not be. You may also have a defective wheel sensor causing the problem...

Wondering if fuel injector(s) is/are going bad

Although faulty fuel injectors could cause the issue you are describing, the symptoms associated with the diagnostic trouble code you found, namely P0344 are consistent with the symptoms that you are reporting. Consequently, you are better off resolving the fault(s)...

Can you help? My car stopped starting.

Hi there. Check the spark plugs and wires to see if the engine is getting any spark to the cylinders. If there is no spark and the spark plugs are white in color, then I recommend replacing the spark plugs...

How much is a starter for 1999 Monte Carlo

Hello - there a number of possibilities for a "no start" condition: dead or weak battery, ignition switch, starter solenoid or motor. I would recommend a starting system inspection by a mobile, professional mechanic, such as one from YourMechanic, who...

My car will not start when I turn the key, it just makes a clicking sound. What is wrong?

A starter like any other mechanical and electrical part is subject to failing sometimes for no apparent reason. However, sometimes this is misdiagnosed as well and often times mistaken for something much more simple like a fuse, relay, or starter...

What could make a car stop running in the middle of driving it?

Hi there. From the description you provided, your vehicle stalling once, could of been caused by variety of reasons. A temporary glitch in any of the vehicle's systems that keep it running. Unfortunately, something like this would be very difficult...

Car began knocking after an oil change, then exploded blowing 2 holes in the side and the oil pan off

It may be hard to figure out why the engine failed without knowing if the oil leaked out or was not filled up. I have seen situations where after performing an oil change the oil leaked out from an oil...

the car has been sitting for a while it goes in gear you can feel and hear it but it won't move

Hey. The most likely cause is the transmission internal clutches are bad or a clutch drum band is seized or bad. Have a transmission mechanic check the transmission pressures to diagnose the problem. Before this make sure the transmission fluid...

Car stalling when put into gear.

It sounds to me like the engine might have drivability problems and the load from the transmission is overcoming the engine power at idle. Have a certified mechanic who is familiar with older carbureted engines inspect the timing and check...

Related articles

How to Buy a Good Quality Cooling System Flush
Your Your radiator does the important job of helping to keep the engine cool. Overheating can cause serious, expensive damage like a blown head gasket (which typically requires complete engine replacement) or warped cylinders. The radiator circulates and cools the...
How Long Does an AC Fan Control Module Last?
The The AC fan control module is what controls both the cooling fans in the front of your car’s radiator, and the blower motor in the passenger compartment. It is mounted within the engine compartment, and that means that it...
Why Won't My AC Blow Cold Air?
When you turn on the air conditioner in your car, you expect to receive a flow of fresh, cold air....