Question about 2000 Isuzu Trooper

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What is the mechanism that comes after the power steering pump in the belt diagram?

I replaced my power steering pump do to a whining, well I replaced it and it still whines. After further inspection, I spun the all the pulleys on the front of the engine and found that the part below the power steering pump grinds like all heck. I don't know what it is and I'd like to replace it myself. I just need to know what it's called.

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  • glowworm0917
    glowworm0917 Feb 20, 2012

    I found out it my AC compressor. I am going to NAPA Auto Parts to get a different serpentine belt to reroute my belt to leave out the AC compressor. I know quite a few people that have done this and it has solved the problem until they are able to replace the compressor. I will leave another comment later today to let everyone know how that works out. I also do not recommend going through muddy water that is as high as the hood. I had to replace my alternator, starter, power steering pump, exhaust flex pipe and now the AC compressor. I saved a ton of money buying used parts and installing them myself but still it's an expense I rather would have avoided. I have noticed though that a a bad shuddering of the front end has stopped with the new power steering pump & pulley. All of this was my fault otherwise I'd still be a happy camper with my Trooper. Take care Trooper lovers!

  • glowworm0917
    glowworm0917 Feb 20, 2012

    I also removed the AC relay (engine compartment fuse box) to ensure it would not engage (or cease moving and burn the belt off). I know it's winter and that is why I don't know why it would go bad on me like this when I haven't used it in several months. It's strange though because I can hear the compressor kick on when I turn the front window defrost setting on with the heat. That is the other reason I removed the relay. If anyone else has/had this problem please let me know. Thanks!

  • glowworm0917
    glowworm0917 Feb 21, 2012

    Problem solved. 80.5 inch belt in place of the 90" effective removes the AC Compressor from the loop. The tension (I measured pounds of pressure at the pulleys) and it is the same. Not all vehicles have schematics to do this but if your vehicle was make without AC, most likely you can do this quick fix during Winter so you can wait for warmer weather to fix it. The bearings are completely shot and my engine is quieter than I can remember without the loud grinding and extremely loud whining it was making. I hope this helps any other 2002 Trooper owners. Take care!

  • glowworm0917
    glowworm0917 Feb 24, 2012

    And I have a 2002 Isuzu Trooper 4X4, not a 2000.

  • Howard Oct 04, 2012

    same experience - I just bought a 2002 4x2 and while running solid I have an annoying whine noise too... Not a loose belt - something more distinct ... thinking either power sterring unit or AC unit - thanks for the 80.5 inch belt idea - might help me figure out what is crying... If it is the AC - any ideas on where to get one - and would the whole thing need to be replaced or just part of it?


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It is a common fault with many cars / trucks, if it is grinding it is beyond lubrication. The good news is parts are available seperate for these pumps. You need a clutch pulley or just the bearing if that comes by itself. Seek part from an A/C specialist as it is normally way cheaper

Posted on Feb 20, 2012

Testimonial: "Thanks, the whole thing is bad. The bearings sound like I lost a few when it spins around and when the air is on, the pulley doesn't even move. Nevertheless I added to my description on how I "fixed" it. Problem solved until warmer weather comes to put in a new compressor. Thanks for the response!"

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