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 - $106.46 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

What others are asking

Coolant fan runs continuously? What can it be?

Hello. Most of the time on this vehicle the issue is caused by a failure in the fan control module. It typically has an internal short that causes this. I usually test the circuit to make sure that the computer...

Fast Idle does not activate when A/C Compressor engages.

The idle is not supposed to increase in speed when your compressor engages, rather the throttle plate should adjust at the same time the A/C engages to maintain the same RPM at idle. This will keep the idle the same...

Blower motor just quit working and it will come back on sometimes

The blower motor is supplied power by the blower relay and should be checked to see if the blower is getting 12 volt power through it. If you do not have power to the motor, then check if power is...

AC not blowing cold air in 2003 Toyota Corolla

If the air volume is low coming out of the vents the likely cause is a clogged cabin air filter which should be replaced. This can happen especially if the cabin filter has not replaced in a long time. The...

Distronic plus, parktronic inoperative, pre-safe limited, ECS off during driving.

Hello, thank you for writing in. There are two possibilities that are most likely at this point. Either the run-up caused the issue, or an underlying issue caused the need for a tune-up. The best place to start is to...

2003 Saturn L200 smells like gas

These are the effects of many concerns that may have little to do with one another. The air conditioning system has a condensation drain which may be clogged on your vehicle causing the water to flood into the interior. The...

When i start my 95 monte 6carlo at 15F it revs at just over 2k, its climb and has made it up to 3.1 before i put it in gear help?

Hello. Thank you for writing in. All vehicles need a higher RPM when cold. The engine needs more fuel and advanced spark timing. The computer monitors all of this with various sesnors. Due to yours being higher than usual, you...

Losing coolant air conditioner and heat not turning on at all

Hey there, thanks for writing in about your 2003 Chrysler Sebring. The problem is that you are low on coolant and the A/C needs to be diagnosed to see why it is not working. If you have a coolant leak,...

Lower radiator hose needs replacement

Hello. If the lower radiator hose needs to be replaced, I would take care of it as soon as possible, as a bad radiator hose may render the vehicle undrivable if it is leaking coolant. If left unattended, a coolant...

Related articles

How Long Should It Take a Heater to Warm Up in Cold Weather
When When you turn on your car’s heater, it should start blowing warm air. If the engine is already at operating temperature, this should happen immediately. However, if your engine is cold, it will take longer and if the weather...
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...
What Typically Causes the Heating or AC to Stop Working?
While both the heating and AC are connected - to an extent - within your car, they’re actually...