Skip the auto shop - Our mechanics make house calls

Q: Alternator belt noise when running the air conditioning

asked by on

My 2003 honda odyssey, about 95,000 miles is making noise (Belt) whenever I turn the air conditioning on. My mechanic sprayed some wd40 on the belt (not sure which one) and the sound temporarily went away. now it is back. My mechanic says to wait changing the drive belts when it is time(105000) to change the timing belt, and believes the problem is the belt, and that I can wait another 10000 miles to do it. He doesn't believe leaving it the way it is now will hurt the car. I have not changed the timing belt. I did all the routine maintenance work. Air filters, oil and filter, spark plugs. Is my mechanic right?

My car has 95000 miles.

A: Hello. Noise signifies a problem. The probl...

Hello. Noise signifies a problem. The problem could be a worn belt but the noise could also be due to a faulty tensioner, misaligned pulleys, or glazing on the belt which by the way in certain configurations will result in the accessory drives running below intended speed due to belt slippage.

It's hard to say what effect WD-40 might have had in possibly masking these other problems, if they exist, and the reality is you can't keep spraying the belt. In essence, the mechanic is suggesting that the diagnosis be put off for six months to a year (10,000 miles). That is you won't know for sure if it is just the belt "alone" and not a weak tensioner or a pulley issue for some time to come.

Generally, unperformed maintenance and failure to perform repairs that are needed brings one on to the proverbial slippery slope. It is better to just repair it now if it is a known issue than to wait and wonder. If it were me, I would just fix it now.

If you'd like a fresh pair of eyes on the situation, consider YourMechanic, as one of our mobile technicians can come to your home or office to diagnose the sound you're hearing for an accurate repair.

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・Save up to 30%

Get a quote

What others are asking

Q: After tinting windows, they are hard to roll up

Hi. Window tint can affect the operation of the windows. Spray the inside of the glass with soapy water. If the window now works properly, the tint is to blame. The noise sounds like a wheel bearing going bad. They...

Q: Vehicle shaking

Hi. Out of balance wheels are typically the most common cause for shakes or vibrations, but there are many other possible causes. They include, loose suspension/ steering parts, an engine misfire, or even a tire that has a bubble or...

Q: Car has rough idle and ticks.

If the engine has low compression on one cylinder it is usually an indication of a damaged valve seat or possibly a bad head gasket. If it is also accompanied by a ticking noise then there may be an issue...

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 to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...