Question about 1989 GMC S-15 Jimmy

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One of the pulleys that the serpentine belt goes over has broken off. I think it may be the water pump but not sure. belt is loose. can I bypass that and use a smaller belt or is some sort of repair needed?

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  • Jeremy W.
    Jeremy W. Dec 30, 2010

    If you bypass the water pump how will the engine stay cool? It will run for about 10 to 20 minutes and then the engine will overheat and then eventually seize. The water pump is behind the pulley that the fan is attached to. If you grab the fan and you can move it around a lot than the water pump is probably bad. If not it should be pretty obvious is something else is broken or out of place.

    The serpentine belt is held tight by an automatic belt tensioner. It is the part on the passenger side of the motor.


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You should fix the broken pulley especially if it is the water pump. If it is in fact the water pump and you bypass it, your engine will overheat and you could cause serioius damage up to needing a replacement engine.

Posted on Dec 30, 2010

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How to fix a leak that seems to be coming from the water pump or A/C?

No, that sounds like the water pump pulley. Loosen the 4 bolts with the serp. belt still on, then remove belt, and remove the pulley and the 4 bolts. Drain the coolant, and now you can remove and replace the water pump. It is not fixable, it must be replaced. Be sure and clean the mating surface of old gasket material and dirt, grease, etc. YouTube should have lots of videos on water pump replacement, maybe one for Aleros.

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More than likely your water pump is going out or has gone out. Also check your idler arm and belt tensioner.

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I want to bypass the air condition unit with serpentine belt need to know how that would effect the water pump.

The serpentine belt is meant to run everything at once. it is a tricky situation trying to bypass a pulley. If the pulley is located at the bottom of the serpentine relay, you should be able to buy a shorter belt and bypass the A/C, but make sure to incorporate the water pump or you're asking for a seized engine. It may or may not be possible. i did it on an 89 Escort, but it was simple and the A/C was located at the bottom of the serpentine cycle. The original belt was 23" and the new belt was 19". Just make sure to wrap the belt around the water pump as it probably runs your timing belt as well.

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Replace water pump 1995 aurora

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Partially drain the cooling system.
  3. Remove or disconnect the following:
    • Water pump pulley bolts, loosen but do not remove at this time
    • Drive belt
    • Idler pulley
    • Water pump pulley
    NOTE: The water pump is attached to the engine with both long and short bolts, be sure to note their locations.
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    NOTE: Note the locations of the 5 long bolts.
  4. Clean the water pump mounting surface. Fig. 1: Be sure to install the 5 long water pump bolts in the correct locations - 3.5L engine 9300z502.gif
    Fig. 2: Water pump mounting - 3.5L engine 9300z503.gif
    To install: NOTE: Be sure to install the 5 long bolts in the proper locations.
  5. Install or connect the following:
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    • Water pump pulley
    • Idler pulley. Torque the bolt to 37 ft. lbs. (50 Nm).
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  6. Refill the cooling system.
  7. Start the engine and check for leaks.
3.8L Engines
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Disconnect the negative battery cable.
  3. Drain the cooling system.
  4. Remove or disconnect the following:
    • Serpentine belt
    • Heater and bypass hoses from the water pump
    • Water pump pulley
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  5. Install an engine support fixture.
  6. Remove or disconnect the following:
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    To install: Fig. 3: Exploded view of the water pump and mounting bolt locations - 3.8L engines 7922xg01.gif

  7. Thoroughly clean all the sealing surfaces.
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  9. Install or connect the following:
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  10. Remove the support fixture.
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  12. Refill the cooling system.
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  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Disconnect the negative battery cable.
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  4. Remove or disconnect the following:
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  5. Install or connect the following:
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3 Answers

My air conditoning compressor is making a grinding noise and it hasn't worked for years. Is there a way to change the pully on the water pump and just put a new serpantine belt on to bypass the compressor?

What engine?

They make a pulley adapter to install in the place of the a/c compressor for vehicles that the a/c con not be bypassed. You local auto parts store will have them. Sometimes they cause more problems than they solve.

The best solution is to replace the compressor with a new or even a used compressor.

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1 Answer

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Under the hood you will see a diagram that shows the routing of the belt, remember where that is you will need to refer to it! Now not knowing what engine you have I will attempt to help you, most engines with a serpentine belt have whats called and idler pulley this is a pulley that's only job is to put tension on the serpentine belt, it is sometimes identified in the diagram I spoke of earlier, if not look for a pulley that goes to nothing, in other words you'll see your power steering pump, your water pump. your a/c pump etc. once you identify it you need to put a wrench on it and pull or push it and you will see it relive tension on the belt and wa la you simply apply enough tension on it until the belt is loose enough to remove then you put the new belt on by lining it up on all the acesories and relieving the tension installing the belt and letting it loose so it can apply the tension! Use the diagram to make sure you have the belt on correctly. If you have any more questions just ask!

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