How To Install Replace Belt Tensioner Idler Pulley Chevy GMC Silverado Sierra Suburban
1A Auto shows you how to repair, install, fix, change or replace a broken, noisy, squeaky, worn or groaning serpentine belt tensioner. This repair takes only 20-30 minutes and requires only basic tools. This video applies to various models between 96, 97, 98, 99, 00, 01, 02, 03, 04, and 05. Chevrolet C and K series Silverado and Sierra pickup Trucks, Suburban, Yukon, Tahoe, Express and Savanna Van, Astro Van, S-10 Blazer and truck.

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Views: 304,104
Added: 5 years
Runtime: 5:50
Comments: 95

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Author Tino Lopez (6 months)
What brand did you use?

Author Gene Reeves (11 months)
Great video,Thanks for the advice

Author fitzpatrickgf (1 year)
Sorry! I meant here, not hear!... I have big thumbs and type too fast.
Going to work! Bye! LOL!

Author Vee eM (1 year)

Author clinton crowther (1 year)

Author brokepainter1 (1 year)
Great video it helped alot.

Author reddog9401 (1 year)
2008 toyoto yaris.bad screeching when starting car,belt looks good,does not
have a belt tentioner.what else could it be?thanks

Author ToxicBuddz23 (1 year)
1aauto, I have a 94' gmc sonoma that squeals while idling but quiets down
around 2000rpms while driveing. I replaced my idler pulley but the
squealing did not stop. What else could it be? Thanks

Author Justin Palmerton (3 years)
Anyone know where you can get new spacers? Mine had a crack in it.

Author jerzyski82 (5 years)
did you put anything between the old bolt head and the new bearing/pulley
when re-installed? I noticed there was no hardware kit for the new pulley
as the new pulley was slightly different from the old GM pulley

Author 1A Auto Parts (3 years)
@ghanemhalabi if the belt is old and cracked you may want to start with
replacing it first. If it is fairly new, then chances are that the belt
tensioner may be getting weak, and needs to be replaced.

Author singlecams (3 years)
@1aauto Could you please check out my latest video of my safari and guess
what the hell kind of noise that is please. Thank you for your videos.

Author 1A Auto Parts (4 years)
Screaming or screeching could be the belt tensioner not providing enough
tension or the alternator starting to lose it's battle with life. 10 years
is a good time to change the water pump and thermostat. Much better to tell
them when you want to change them than the other way around.

Author ScoobyDigites (3 years)
on damp or rainy morning when I start my truck up it squeaks something
terrible but only happens on wet day on the first start up would doing this
solve that....already have a new gator belt

Author vfbc69 (3 years)
I sprayed some belt conditioner on my 2002 silverado, and after a few mins,
it started screeching, I did sprayed with the engine running, do you think
i'll go away after I drive it a while,, I see the tensioner moving with the
noise, do I have to replace it,

Author 1A Auto Parts (3 years)
@singlecams It's kind of hard to tell without being able to look at the
vehicle. I would check all of the steering components to see if anything is
worn out. Hope this helps you out.

Author 1A Auto Parts (3 years)
@ghanemhalabi It could either be a worn belt or if the belt is fairly new,
the belt tensioner may need to be replaced. As time goes on and they get a
few miles on them they tend to loose their tension that they once had. Hope
this helps.

Author slowride55 (2 years)
At first I didnt watch your video because I didnt see idler pulley in the
title. My truck now has a new pulley thanks to your video!! Thanks so much
it really helped!

Author macdeezy2915 (2 years)
Will this cause squeaking during start-up and while in gear?

Author Antonio Powell (1 year)
How would rewind the spring

Author Justin MacIver (1 year)
Would a clicking noise from the pulley/idler be needing replacement?

Author Mantrin185 (2 years)
Thank you for the video, it helped me fix my brother-in-law's truck.

Author 1A Auto Parts (3 years)
@TheTommy0528 You can just replace the belt.

Author 1A Auto Parts (2 years)
If you have a bent pulley some place, that could throw off the routing on
the belt and cause it to jump off. You might want to look for another issue
causing that pulley to not sit correctly anymore. Pulleys normally don't
bend unless there was an outside force causing it to.

Author Whitestingray81 (2 years)
I'm sure you've gotten a million questions like this... but: I just had the
intake manifold gasket replaced. Now, at low RPM's (1,000-1,500) there is a
sort of vibration noise. I think I tracked it down to the tensioner. Think
changing it out for a new one would solve my problem? Thanks!

Author 1A Auto Parts (1 year)
The belt tensioner may have gone bad, you may want to check it.

Author Syphon787G (3 years)
Dang everytime i look for info on my blazer i always come here haaha thanks
for making the videos i had to order a few parts from you guys to

Author 1A Auto Parts (3 years)
@footballbeast67123 HI at the current time we do not have an auto repair
video that shows this particular repair. We'll keep this in mind during any
repairs on this vehicle in the future.

Author Jeff James (3 years)
Are you kidding me? LOL I have just spent 45 minutes trying to figure out
how to get the belt back on my 6.0 chevy, (took the idler pulley off to get
the belt off) Watch 3 minutes of this video and Done!! Thanks I subbed!

Author keeperodafunk (4 years)
my idler pulley was screamin' like a banshee. i'm a ford guy. tensioner is
different. i pushed one way then the other with little results. i was
perplexed by the three holes in the front of the tensioner. then it hit me.
uuuuuuuuuuuuuutube! thanks man. you saved me. i was finished in 20 minutes.

Author 1A Auto Parts (2 years)
@macdeezy2915 If the belt is very loose. It's possible that this would

Author tmoney (3 years)
Can I just replace the belt?? Or I have to buy the pulleys too??

Author 1A Auto Parts (5 years)
You do not need to install a washer on the front of either the idler pulley
or the tensioner. You DO need to switch the spacer from the back of your
old idler pulley to the new idler pulley. That is covered in the video.

Author Joshua MacDonald (4 years)
Would this process work for a 96 silverado 1500?

Author Fred Barrett (3 years)
i think i have a noisy pulley, its the wheel-thing. it has play in it. do i
have to change the tensioner assembly as well?

Author UserName89 (3 years)
I have a groaning noise coming from my 2002 Blazer 4.3. I'm about 80% sure
that it sounds like it's coming from the alternator but could it be the

Author ghanemhalabi (3 years)
I have a squealing belt, but only when the car is running idle, as soon as
i press on the gas it goes away, is that a worn bearings on one of the

Author 1A Auto Parts (3 years)
@Dancelikeaboss You're welcome. Have a great day!

Author 1A Auto Parts (1 year)
You may have to get an air gun to shock the bolt free from the crank.

Author 1A Auto Parts (3 years)
@vfbc69 Remove the belt, spin the tensioner and idler pulleys they should
spin freely with little noise Also try to move them back and forth. There
should be no play. If they have play or do not spin freely then replace

Author Alberto Mendez (1 year)
how do i know the belt tensioner doesn't work well?

Author kevinsunnyside187 (2 years)
hey 1aauto i have a 2002 Chevrolet Silverado 1500 2WD there a pulley next
to my ac compressor it look like its slanted and the belt it only using
haft of the pulley ween its running can that be the problem that's why its
make nose sometime it gose off and on but when i gas it. it well make the
nose and ween i let go it the gas it stop thanks for the help

Author Hector Mercado (2 years)
good. will follow instructions.

Author Liisa Lee (1 year)
Any tips or secrets how to release/remove a bolt to replace a crank pulley
from a 1991 Old Cutlass Cierra? The belt keeps falling off so the pulley
needs replaced but unable to get it loose. Going on two days now trying to
get this thing loose and no luck thus far. Thy guys have tried everything.
Any tips would be appreciated.

Author 1A Auto Parts (2 years)
The lock washer keeps the pulley from moving.

Author 1A Auto Parts (1 year)
If the belt is old, it could be a bad belt, or a belt tensioner that has
become weak and needs to be replaced.

Author chuckhice (3 years)
ok, i had to remove my tensioner pulley so i could see what i was doing
with a water pump replacement. i am ready to put the belt back on, i put
the tensioner on, put the belt on and it is now too big.. it is the same
belt that came off.. any idea what could be wrong???

Author Dancelikeaboss (3 years)
thank you!

Author 1A Auto Parts (3 years)
@mrtymemrtyme You're welcome. Have a great day!

Author 1A Auto Parts (2 years)
@theduelist04 You're welcome. Thank you for visiting our YouTube channel.
Have a great day!

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