Skip the auto shop - Our mechanics make house calls

Q: AC makes noise after putting on expansion valve

asked by on

We had our compressor replaced, it was locked up. Replaced that with another and it locked up within the month and blew fibrous stuff all through our system to rear AC. Had to have it flushed and replaced this compressor. It wouldn't cool good so my husband put an expansion valve on it and now it whines and makes loud noises when you turn AC on and off, also now sometimes while you are driving. What is causing this? Can you tell me what is going on?
My car has an automatic transmission.

Hello. It sounds like your new compressor may be failing. Flushing the system is not enough when the compressor fails. When there is debris in the system, it gets stuck in the expansion valves, the condenser, and the accumulator. If these are not replaced then the new compressor’s life will be short. If you want to have this problem fixed, consider having a technician from YourMechanic come to your home or office to diagnose the AC noise and make the necessary repairs.

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: Loss of power!

Hi, thanks for writing in. This sounds like a bad fuel pump and or bad fuel filter. The hard start may be a low fuel pressure cold causing the hard starting. Have the pressures tested and leak down checked to...

Q: Air conditioning only gets cold when car moving

The a/c fan may be the cause on this vehicle or the controller for the fan. A check to see if the fan motor is getting proper power from the module is the first test needed. I recommend having a...

Q: Transmission makes high pitched whistle intermediatly

Hi there. The whistling noise from the transmission could be either a thrust bearing failing or a clutch pack is slipping under certain conditions. First check the fluid to the transmission and make sure that its full and red in...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.