Q: Rat under Hood.

asked by on

What would cause belt squealing after replacing whole serpentine system. And 2 idler pulleys?

Of course, you want to be sure that the noise is really from the serpentine belt and/or connected rotating elements. If you simply take all of the belt driven accessories out of the picture by removing the drive belt and then briefly run the engine that will provide confirmation. If the noise does disappear with the belt removed, it may be that certain pulleys were not replaced and/or the noise could be coming from defective bearings in a driven accessory such as the A/C compressor or the alternator. An additional thing to check is whether all of the pulleys are in the same plane. For example, if the crankshaft pulley on the harmonic balancer is out of position, the serpentine belt will not run straight, possibly causing noise. If you want these steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request serpentine belt noise diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Rat under Hood.

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: Have no reverse and a transmission fluid leak

I would recommend having your transmission inspected by a certified transmission expert to determine the exact cause of this issue. It is very possible that some internal damage has occured to the transmission from the loss of fluid. It is...

Q: 2002 suburban sounds like an air leak coming from the back of the block its very loud like screaming sound after about a week its

Hi John. Thanks for contacting us today. It's quite possible that you have an exhaust manifold or exhaust system leak that is causing the noise. That is typically what causes the noise you are describing.

Q: My car feels like jumpy or chirpy. I had oil change a week before.

Hi there. Check the serpentine / drive belt on the engine. The chirping noise that you are hearing is the belt being loaded up or slipping. If the belt is old, then I recommend replacing the belt with a new...

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.