changed belt; still squealing. why?

[usafracer]

You battery is weak. It draws a lot of power to start the truck. Then the belt slips on the alternator when it starts due to the heavy load. Alt could be weak as well.

[NHDave]

Originally Posted by gabe5410

changed a/c belt week and a half ago still skweaking why?

Because.

[gabe5410]

changed my ac belt week and nahalf ago...still squeaking when i start car why? how can i get rid of noise or will it eventually go away

[trlhiker]

Originally Posted by gabe5410

changed my ac belt week and nahalf ago...still squeaking when i start car why? how can i get rid of noise or will it eventually go away

See all above posts.

[PDD]

Originally Posted by southgeorgia

thanks for the replies. i'll look at replacing the tensioner bearing and see if it helps.

the water pump has the same mileage; that was the original belt. i think the actual mileage is about 108k.

Find the actual source of the squeal before you start swapping parts.

Before you change the tensioner squirt a little WD40 on the bearing. If the squeal stops you know it is time to replace it.

[jambo101]

Originally Posted by gabe5410

changed a/c belt week and a half ago still skweaking why?

Belt isnt tight enough.. The squealing you are hearing is the belt slipping on the pulleys,however if one of the pulleys is seized then no amount of tightening will stop the squeal..

[usafracer]

Originally Posted by jambo101

Belt isnt tight enough.. The squealing you are hearing is the belt slipping on the pulleys,however if one of the pulleys is seized then no amount of tightening will stop the squeal..

It has an auto tensioner so this is not the problem.

[NJGOAT]

Originally Posted by usafracer

It has an auto tensioner so this is not the problem.

Word. If you've change both belts and it's still squeaking there is a 99% probability that it's the tensioner itself.

[Don57]

Originally Posted by NJGOAT

Word. If you've change both belts and it's still squeaking there is a 99% probability that it's the tensioner itself.

Agree and in most cases, you don't need the whole tensioner but just the pulley that goes on it. I've replaced both belt tensioners and idler pullies and have learned that the tensioner's spring is almost always still strong enough for it to apply ample tension on the belt. It's the pulley's bearings that wear and cause squeal from an imbalance. In most applications, the Idler pulley is the same pulley that is on the tensioner.

If you are on a budget, consider that route and check it out.