Skip the auto shop - Our mechanics make house calls

Q: Serpentine belt is squeaking/chirping - 2006 Ford Expedition

asked by on

Just purchased this vehicle a few months ago when I began to notice a quiet squeak coming from the engine when I would avcelerate. Took it back to the dealer mechanic who said it was just a dry belt. He sprayed some liquid on my belt and the problem went away. Its been fine for a few weeks but today the squeak came back. Should I just find whatever spray he used and respray the belt or does it need to get changed. Mechanic at the dealership said the belt looked fine.. should I get it changed anyway or just get it sprayed? What kind of spray do I get?

My car has 120000 miles.
My car has an automatic transmission.

A: When the car was built, I guarantee that Fo...

When the car was built, I guarantee that Ford didn't have a guy on the assembly line spraying belts. I would first check to make sure that all of the pulleys are ALIGNED. It is not unusual, for the PULLEY on the crankshaft harmonic balancer pulley to move (generally outward) relative to its original position. The pulley is rubber bonded and over time can move. If that pulley moves, that means that the belt groves are no longer running in a perfect plane and that alone can cause noise. At 120,000 miles you might also consider the condition bearings in the idler pulley and belt tensioner. The grease in those bearings eventually dries out and that can contribute to or cause noise of the type you are describing. To my knowledge, you should not have to spray a serpentine belt to quieten it. The noise is indicative of another issue. I recommend getting a second opinion on the vehicle from another mechanic. If you'd like to have this checked by an independent mechanic, one from YourMechanic can come to your home or office to inspect the sound and can follow through on recommendations.

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・Save up to 30%

Get a quote

What others are asking

Q: Check Engine light P0304.

The code P0304 points to a misfire on cylinder number 4. Ford also has a funny cylinder identification pattern, different from many makes, and a diagram should be consulted to determine which cylinder is the right one. The spark plugs...

Q: Car makes a screeching noise when foot is on brake and in drive.

Hi. This is a tricky problem to solve because it is intermittent problem. A lot of times with intermittent problems, they have to become a consistent problem so the problem can be fixed properly. There is a possibility that the...

Q: Clutch and air conditioner compressor problems

Hello. It is likely that the air conditioner compressor is breaking your serpentine belt because it has seized up. I suggest that you have a trained technician replace your serpentine belt to get your car back on the road safely....

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...
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.