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

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

Get a quote

What others are asking

Q: Air condintioner won't come on.

Hi there, thanks for writing in. In most cases, when the AC or heater is not blowing air, it's caused by an electrical problem with the blower motor or the motor is broken and needs to be replaced. The AC...

Q: A/C

Hi Veronica. I'm going to forward your question to our sales department who should be contacting you shortly. In most cases, when your AC is not cooling the inside of your cab as well as it should, it might be...

Q: Car overheated, now it won't start after cooling it down and putting more water in

Hey there. There are many things that can happen when your engine overheats. The worst of which is a blown cylinder head gasket. When this happens, the gasket between the cylinder and the engine block becomes compromised allowing engine oil...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...