Skip the auto shop - Our mechanics make house calls

Q: Truck screaming

asked by on

My truck started screaming and I can hear a light knocking noise. Next the air conditioner went out, followed by oil leaking from underneath the truck. It still starts and drives.

A: Hello. It sounds like your AC compressor ma...

Hello. It sounds like your AC compressor may have failed. If the compressor fails internally it will lock up and cause the belt to squeal and make this noise. The compressor can also release oil when it fails. I would start by checking to see if the belt is still on the engine. If it is, then I would remove it and try spinning the compressor by hand to see if it moves. If it does not, then it needs to be replaced. If you are going to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your truck’s noise and air conditioning issue so that proper repairs can be made.

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: Car stalls and has trouble restarting

Hi There, What you are describing sounds like an ignition coil pack that may be failing. Ignition coils are prone to this type of erratic functioning or heat cycling when they are beginning to fail due to the temperature fluctuations...

Q: AC/heater fan runs constantly even with switch off

The most common cause of this problem is the blower motor control processor mounted in the A/C evaporator case. I'd start by checking that first I were you. I you need some assistance however, feel free to contact a professional...

Q: Transmission Leak from TV cable? (Kick down cable)

Hello. The first thing I would do is check the transmission fluid properly. With the engine running and the vehicle in park, check the transmission dipstick to see where the fluid level is out. If you overfilled the transmission and...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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...