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.

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

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: Squealing of the engine while going uphill and at around 2000 RPM

A squealing noise may be the serpentine belt slipping or one of the accessories binding. Your tensioner or pulley may be bad and need to be replaced. Finally, your compressor pulley bearing may be going bad and it could seize...

Q: Will the car still run if the serpentine belt breaks

Hello, thank you for writing in. The vehicle may partially function when the belt breaks. but it will typically stall out within a matter of time. The alternator which is charged by the belt power all of the electrical components...

Q: Clicking only, won't start. At first it would in neutral, but not now.

You may have a problem with the gear selector, neutral-park safety switch or the transmission linkage. I suggest taking your truck to be inspected by a reputable mechanic, such as one from YourMechanic, for diagnosis. Doing so will save you...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...