Question about 2003 Chevrolet Silverado 1500

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I changed the alternator on my 2003 silverado 1500. how do I loose the belt to get it back on the pulley.

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There is a spring loaded pulley right on top that you can put a wrench on and turn it to loosen the pulley. Put the belt on all of the pulleys except the spring loaded pulley. Then get your wrench on the spring loaded pulley. I believe it is 18 MM. Then turn the wrench to loosen the pulley and slip the belt on.

Posted on Sep 04, 2010

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Use a 3/8" ratchet to insert in the square hole to release the tensioner to apply the belt onto it

Posted on Sep 04, 2010

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2 Answers

My serpentine belt made a little squeling when it was wet or damp out, now it's doing it all the time and it really loud, could it be a pully and if so which would be the most common one to do?


It could be a pulley, sometimes a worn belt will do that. Check the idler pulley, tensioner pulley, and alternator pulley, then check all the rest. If an alternator bearing is going bad, it may leave you stranded someday.

Jan 16, 2013 | 2003 Chevrolet Silverado 1500

1 Answer

Im trying to change the altinator in my 2003 silverado v-6. i took the two bolts out the electric componets and still cant get it loose.


Hi: !st Thing you need to do is disconnect your negative battery cable to prevent more damage.If i'm understanding you Right you Took the Wiring off the Alternator.Or did you Remove the Mounting Bolts? Here Goes Disconnect Battery, Loosen the Bolt on the Alternator Adjuster Bracket, This will give you Some Slack in the Belt ,BUT Locate the Belt Tensioner take a Breaker Bar or The Correct Size Boxed in Wrench or use a Ratchet and Socket. The Tension Is Spring Loaded to Keep Your Belt From Coming OFF. Your Belt Runs Probally Everything like your Alternator ,Water Pump,A/C Compressor,Power Steering So On. So Until you Take the Belt Either OFF or Just Release the Tension on the Belt,I'm Sure if you Have Removed All mounting Bolts and Your Wires to The Alternator, Your Alternator Will Come on Out with a Little Light Effert. Be Sure You Watch How Eveything Comes Off Cause You'll Have To Reverse the Way you Took It Off To Put it Back Together. Be Sure You Look At the Belt Routing Diagram Which is on either your Cross bar By The Radiator. Its Say Belt Routing Diagram. Hope This Gets you Going It Should.If You Follow These Instructions. Please Let Me Know how My Advice Helped You By Voting And Also You Can Send me A Message on FIXYA. From The WYOCWBOY

May 30, 2010 | 2003 Chevrolet Silverado 1500

1 Answer

Chevy Silverado 2001 trouble removing serpentine belt


its right above the crankshaft pulley,it is smooth and you will see the ribs of the belt because the smooth side of belt is on this smooth pulley

Mar 12, 2010 | 2001 Chevrolet Silverado 1500

1 Answer

How do I loosen the serpenteen belt on my 2000 chevy silverado 1500? I need to replace the alternator.


If it's a v8 then when looking at the engine the top left pulley has a 15mm bolt holding the pulley on. Use an endwrench and move/pull it to the drivers side of the truck!

Dec 09, 2009 | 2003 Chevrolet Silverado 1500

1 Answer

Serpentine belt diagram for a GMC 2003


if you just changed the alternator you should do the belt too,if you get your belt from Auto zone or NAPA the belt routing is on the back of the package

Dec 02, 2009 | 2003 GMC Sierra 1500

1 Answer

Need belt diagram to replace belt after changing alternator 2003 Chevy Silverado 1500HD


The diagram should be in the engine bay somewhere. usually on the front crossmemeber or possibly hood. If that doesnt work, contact one of your local autoparts stores. They should have a database that they can print a diagram from.

Nov 08, 2009 | 2003 Chevrolet Silverado 1500

1 Answer

How do you get the alternator back on 2003 2500


The belt tension is automatically adjusted with the tennsioner pulley. As far as putting it back on, I am not sure what you mean, you just need to bolt it back up and pull the belt over the pulley.

Oct 28, 2009 | 2003 Chevrolet Silverado 1500

1 Answer

03 chevy 1500 sqealing when a/c on replaced pulley did not fix it. A/c quit yesterday any ideas... Compresor?


sounds like belt is loose and when load is put on it it just slips and wont engage the compressor and it will squeak. try tightening the belt or check to make sure your tensioner isnt bad

Jun 29, 2009 | 2003 Chevrolet Silverado 1500

1 Answer

2003 SILVERADO 1500 2WD ALTENATOR REPLACEMENT


ONE OF THE PULLEYS SHOULD HAVE A SQUARE DRIVE (3/8 DRIVE) PUT A RATCHET IN THAT HOLE AND ROTATE THE "TENSIONER" TO RELEASE TENSION ON THE BELT.

Apr 30, 2009 | 2003 Chevrolet Silverado 1500

1 Answer

Pulley broken belt spilt in two half off half on


i looked it up ,,,it seems to me it is the supercharger pulley...if you do not have the supercharged model it is most likely the alternator.

Nov 28, 2008 | 2003 Chevrolet Silverado 1500

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