If you can get at them with a drill buy an easyout which is like a drill bit but the threads are backwards. The size of the bolts will determine the size of the easyout and the size of the drill bit to use. Drill a hole down through the middle of the bolt and then insert the easyout and turn counter clockwise. The bolt should come loose. Soak the bolt first with liquid wrench or some other penetrating fluid to loosen up, the longer the better. If you have room to put a pair of vise grips on the bolt then this method would be easier. The secret is to soak with the liquid wrench for as long as possible.
I have used the PB Penetrating Catalyst to unfasten one of the rusted and broken bolt on my old brake caliper. It took few spray and overnight to break the tought broken bolt but it's better than drilling the threads in my opinion. This product is amazing and I have told my friends to try this as well.
www.pbblaster.com
First get under the car, and remove the 4 bolts/nuts securing the seat base.
TAke the bolts soose that hold it on. It is an assembly.
Depends on which pulley but most have several bolts holding them on. You can remove the broken bolt or simply not worry about it.
Undo front pipe from manifold. Remove the bolts holding manifold to the cylinder head. Take manifold to machine shop to get it planed straight. Reverse proceedure to install. You will probably have broken bolts (very common problem on this vehicle) so they will need to be extracted. Not the job for at home unless there are no broken bolts but the rearmost bolts usually are broken.
remove the trim from the interior of the lift gate. There is access to the connecting rods that will release the catch from the Nader bolts.
You must remove the brake rotor or hub and punch out the broken bolt inwards, then press a new bolt in from the same direction.
You will need to remove the grill from your 2000 GMC Jimmy. With the grill removed. You can remove the hood latch retaining bolts. The hood will be released with the latch bolts removed.
Remove bolts from inside of glove dep. Remove bolts under defrost vent. Remove bolts from panels on side of dash. I think there is a total of 6-8 bolts.
Anytime you remove the head bolts, replace them with new ones. If one is broken off in the head, use an Easy Out Extractor to remove the old bolt. Any auto parts store will sell or rent you the tool.
remove the nuts from the u bolts and remove the bolts. Install new ones and tighten the bolts.
Try heating the bolts. Hopefully, as the heated bolts (which has expanded on heating) cools down and contracts, the corroded bond will have been broken. Try spraying with WD40, or dabbing on diesel, while the bolts are still hot.
Take the grill out and remove the bolts holding the latch on.