Click on the link below to view "step by step" information on how to replace your water pump. This information is the same for all GMC cars and trucks:
http://www.ehow.com/how_4508716_install-water-pump-gmc-sierra.html
It's a bit diffycult without knowing which engine you have or in fact which model. On transverse engine layout late model gmc's you would have to remove the timing belt and fan/serpentine belts to access the waterpump. Remember to place cylinder no 1 on top dead centre and take note of the timing belt markings before removing the belt.
For longitudinal applications the fan, fan cowling needs to be removed before you can get at the pump. After this the same cautionary rules apply as per the transverse engine.
That makes things far easier. No need for moving the engine about. You will need to remove the top and bottom radiator hoses. (Removing the top hose is just to make access easier) Removing the hoses will cause a large amount of coolant to spill as it is impossible to catch all of it in a container so do this in a spot away from where you will be working.
Loosen the locknut(facing front) on the top front of the alternator. Loosen the lower alternator bolt(No need to remove it. Just loosen) Slide the alternator towards the engine. The V-belt can now be removed.
Remove the 2 hoses on the top of the pump. Undo the 4 bolts on the front of the water pump pulley and remove the pulley. You can now remove the 4 mounting bolts that hold the water pump to the block.
Once removed clear any old gasket and/or sealant on the inlet ports on the block. You can use a sharp blade for this. Reinstall in the reverse of removal. Remember to use new gaskets. If you have difficulty removing a hose, grip it firmly on the part which goes over the pipe and twist it. This will break the rust bonding it and you can now remove the hose. Inspect old hoses and replace if cracks are visible. If you have difficulty in fitting a hose, soak the end in boiling water for a minute. You can use a small amount of dishwashing liquid on a pipe end to have the hose slide over easily. Remember to add antifreeze to any water you put in the cooling system when filling. Dilute it at least 50/50 water and antifreeze(More antifreeze for colder climates)
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It's a 1997 w/ the 350 V8 and airconditioning
OK, now that I have told you the engine/model we are working on; as I look at the engine from the front of the car, is the #1 cylinder on the front right or front left and how do I go about determining whether it's at TDC or not?
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