Skip the auto shop - Our mechanics make house calls

Q: The AC repair person suggested that I replace the system entirely.

asked by on

I would have thought to change the compressor and flush the system to see if there are any other problems. I note there is a danger of damaging the new compressor but I just need to understand the procedure. My mechanic of course makes more money if I buy all new parts and he installs them. I'm just making sure there may be some sanity in checking the other parts first.

The air conditioning works when the car is moving fast but quits in slow traffic. When it is working it struggles with extreme temperatures.

This is a 2006 Mercedes E350 sedan. bought it new 10 years ago.

My car has 150000 miles.
My car has an automatic transmission.

A: Hi there. Assuming, the diagnoses for the A...

Hi there. Assuming, the diagnoses for the A/C system are not working in traffic, this is a faulty/weak A/C compressor. It needs to be determined whether the system is contaminated. An A/C compressor (only) replacement can be successful if no contamination is present. The standard with no contamination is to replace the A/C compressor, the receiver/drier, the expansion valve/orifice to keep the compressor warranty intact. When contamination is present, the condenser is also replaced (not flushable), and the rest of the system is flushed. There are other possibilities for inoperative A/C system in traffic, such as radiator cooling fan issues. I recommend having your vehicle's A/C issue diagnosed and repaired by a certified technician, such as one from YourMechanic.

Was this answer helpful?

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: No cold air from air conditioner

The air conditioning system is charged with refrigerant and a specific amount is needed for the system to operate. The compressor is the component that cycles the refrigerant through the system. However, electrical and mechanical failures are possible on the...

Q: car eems like it automatice comes out og gear, it has to be turned off and re-cranked to get it back in gear

The problem sounds like it has a valve body that is not working correctly and would need to be replaced. The computer would need to be reprogrammed by the dealer in this case since the vehicle would need to have...

Q: My 1998 Isuzu Rodeo LS gets hot, then cools, then gets hot and stays hot

This can be caused by a number of things, such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know, the coolant fan switch helps to maintain the proper coolant temperature by turning...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...