Q: Honda civic 2002 makes a lowd knocking noise when the compressor is activated. I replaced the compressor, added oil, vacuum tested

asked by on

Old compressor was leaking and was making a knocking noise. I replaced the compressor and dryer. I added oil (5 oz) into compressor before installing it. Vacuum indicated no leaks. Then recharged with R134 (about 20 Oz) . Knocking noise is still present, unbearable. Air is cold. belt was tightened. What would cause a load knocking noise whenever the compressor kicks in?

How much would it cost to fix the problem. Replaced parts were brand new.

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

Hi there. Since you just replaced the compressor, it may be that the AC system is overcharged making the compressor hard to turn. It is also possible the new compressor itself is defective.The best advice we can offer here is to have one of our professional mobile mechanics come to your location and complete an AC is not working inspection. This will allow them to inspect your vehicle and determine what exactly is causing this noise and then recommend a repair that should resolve the issue. Since there are multiple possible sources, providing you a good estimate for repairing this issue would be very difficult.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Honda civic 2002 makes a lowd knocking noise when the compressor is activated. I replaced the compressor, added oil, vacuum tested

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: Car suddenly not starting - 1997 Honda Civic

Hi there. It sounds like a failed starter or battery. Have a battery test performed with a digital battery tester that provides the cold cranking amps and state of health. Check all fuses/relays and replace as necessary. Perform a voltage...

Q: Car grinding and shaking while driving.

If your car has a manual transmission, the some of the hard parts inside the transmission may be damaged. A manual transmission has gears, bearings, brass synchronizers, etc. Some of these are used together in certain gears and not in...

Q: Car will turn over but won't start?

The most common cause of no start on these vehicles is the ignition components inside the distributor causing no spark or sensor reading to computer. Most times replacing the distributor fixes the problem of no spark.

Related articles

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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.