Skip the auto shop - Our mechanics make house calls

Q: Alternator belt hardly lasts more than two days. Meanwhile, when ever the belt is changed, it works well for two days again

asked by on

The alternator belt is always damaged within two days after replacement. Mean while after replaced it will work well without any indication that it was bad. The car losses pressure when slowed down and want to fire again, and possibly it will go off

My car has 223562 miles.
My car has a manual transmission.

A: Hi there - if the belt is failing within 2 ...

Hi there - if the belt is failing within 2 days of driving, there is a problem with one of the components driven by the belt (alternator, AC compressor, water pump), the belt tensioner, or an idler pulley. If the belt is not tight enough, the belt will slip, overheat and fail. This could be caused by a bad tensioner. If an idler pulley bearing has failed, the pulley won’t rotate, and friction overheats the belt, and it fails. Same for an alternator bearing, water pump bearing, locked up AC compressor. Check all components that rotate with the belt for free and smooth rotation. Replace the belt tensioner if there is any doubt as to proper tension. I would recommend having an inspection of loss of power completed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost for repairs.

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 stutters when idling

Engine misfires can be caused by many different problems and are generally caused by either a spark or fuel issue or in some cases, a combination of both. Spark related problems generally will result from things like ignition coils, crankshaft...

Q: Car misses

If you have went as far to do compression and leak down, I’ll assume the problem is not obvious. After those tests, you can be almost sure the mechanical components of the engine are good. Is it a random misfire...

Q: How do I make a phone call by number?

If you don’t have a contact stored in your phonebook, you can make a Bluetooth phone call with the number. To do so, follow these steps: 1. Press the Voice Recognition button. 2. Say “Call." 3. When prompted, say “By...

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...
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 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.