Question about 2001 GMC Sonoma Extended Cab

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Change alternator How do I change an alternator on a 2001 Sonoma

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  • Anonymous Aug 09, 2008

    how to change the alternator on a 2000 GMC Sonoma SLS

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Just did one last night.

As your facing the truck with the hood open, you'll notice the tenion roller just beneath the alternator and the alternator drive pully.

Under normal circumstances, you should be able to put a 1/2" inch socket onto a ratchet or breaker bar and turn to the left to release the tension. Oh no, they had to make it complicated.

What I did was take a tire iron, place the tip just above the pulley, onto the arm itself, and push all the way towards the drivers side. It may be seem difficult and be very careful making sure you have solid contact with the arm. You do not want to damage your pulley or belt.

As the tension is released, slide the belt out from underneath the center pulley between your alternator and A/C unit.

Disconnect your battery, and the wire behind the alternator. Unplug the plastic connector as you want all of your wires / obstructions out of your way.

All of your bolts are 1/2".

Loosen both bolts, of the alternator, and you'll see as you break them, you can unscrew them with your hands.

From the drivers side, I, again, entered the chisel part of the tire iron and lifted up towards the passenger side and the alternator popped right out.

Do the reverse only making sure your belt is perfectly aligned with ALL pulleys as the slightest bit out of whack will make it very difficult to re-install the belt.

Posted on Jul 29, 2008

The lug wrench method or prying is not the way to go.

GMC was nice enough; they placed a square hole in the front of the tensioner. Do not use a lug wrench; use a Craftsman socket driver. The square end of the socket driver fits perfectly with less risk of damaging the vehicle.

Here's some tips -
0 Get a light so you can see what's what and wrenches to fit 1/2" and 15mm nuts/bolts.
1 Disconnect the battery.
2 Charge the battery; Reduce the risk of blowing the alternator
3 Get a pan, a plastic bag & a rubber band to catch anti-freeze.
4 Remove the cowl covering the radiator - Unplug electrical connector from cowl on right side.
5 Place the pan under the vehicle under the upper radiator hose
6 Remove the upper radiator hose.
7 Immediately bag and rubber band the engine where you
removed the hose.
8 Manuver the cowl up and out of the vehicle.
9 Unplug connector from the alternator with a small screwdriver and gentle pull. Then remove rubber boot and bolt holding red wire on terminal post. Push wires gently out of the way, noting where they are.
9 Reach behind to the lower part of the the alternator; feel the back bolt and turn by hand or feel a wrench onto it.
10 Remove the bottom bolt from the front and there is another to the right on the engine block (3 total bolts).
11 Cup hand under alternator and manuever up and out of engine compartment. Place in box of new alternator for return as a core (about $60).
12 Manuever new alternator into place. The long bolt goes through the cast tube near the top of the alternator.


Posted on Aug 10, 2008

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Posted on Dec 05, 2009

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SOURCE: how do i change my

First unplug your Battery Positive Cable for eventual shock...Then Look carefuly on the side of your alternator unplug terminal cable end look carefuly arround your alternator for long bar with adjusting plate loose this plate to releast your belt... Then loos up all the bolt holding up your alternator then your ready to chage for new one...Good Luck

Posted on Oct 01, 2010

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Posted on Jan 02, 2017

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