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I have a 2000 E430. I just did this job because my ac compressor froze. I went to O'reilly and bought a serpentine belt 6pk2310.(different brand has it as k0910). The numbers after the part number is the length in mm or inches. Eg. 0910 = 91 inches == 2810mm. Just follow the diagram and bypass the ac compressor. Tools: 15mm wrench for the pulley tensioner. It took me 5 minutes to do this job and be on the road again. It is very easy. On the Right is the normal diagram.
On the left is how you bypass the AC compressor on a E320/E430 2000-2002 engine.
You may be able to remove compressor and purchase a pulley with an arm that atttaches to the block in place of compressor. Or remove compressor altogether and install a shorter serpentine belt. Hope this has been of some help.
Check for a fuse that indicates radio and replace it if it's burnt through or melted or discolored. The Buicks have dash controls that require expensive repairs sometimes to get the temperature controls to work so some people jump around the controls by installing a separate toggle switch that directly turns the AC unit off and on for 92 through 94 Buicks. Any AC shop can install the bypass wires.
the defrosters run with the ac compressor running whenever its 49 degrees and higher. it does that to get rid of humidity faster. the pulley works off the ac clutch behind the pulley so you have a locked up clutch. find a belt to fit by bypassing the ac compressor will do if you like
its the same. but a different pulley takes place of the a/c compressor. I know DORMAN makes a few "bypass pulleys" to do this, but dont know if they make one for your truck. at the worst... you will need to get a pulley and bracket from the dealer for a truck without a/c . as long as your a/c pulley bearing is ok, you can let the belt run there.
there should be a manual bypass to remove the clutch to the compressor otherwise measure the belt and go about 10 inches or shorter (just a hint to get the belt off use the tire iron wrench and push the tension pulley toward the cab of the car the thread is reversed)