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.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: What are the various functions on the manual Heating and Air Conditioning system?

You need climate control to make sure that you’re cool in the summer and warm in the winter. Your car’s Heating and Air Conditioning system gives you the ability to maintain the ideal temperature inside the cabin at all times....

Q: Rubbing/vibrating noise from front end

Hello. From what you describe it would appear that your tire may be making contact with something and causing the noise and vibration. Noises can be difficult to diagnose without driving the vehicle, however if you have determined what wheel...

Q: The driver's side block is getting hotter than the other side

Hi and thank you for contacting YourMechanic. Most likely what is happening here is that the water jacket in your engine on the right side is obstructed and not allowing sufficient coolant to circulate causing the left side to become...

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...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...