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Originally Posted by tobybul
I also checked the compressor pulley and and it turns freely. I didn't see the triangle thing being mentioned. Can I check for leaks without putting a belt in?
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The pulley will turn free anytime the clutch isn't engaged. You need to try to turn the piece in front of the pulley to actually make sure the compressor turns. It should turn harder than the pulley, but it should be smooth. If you can't get it to turn by hand the compressor may be locked up.
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Originally Posted by tobybul
By the way, I haven't gone this far yet but is there a belt tensioner on the 85 300D to loosen the main belt so I can slip the AC belt on? Sorry for the question but I had not checked. I would expect see a tensioner otherwise how can you replace belt.
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There is no "main belt," there are two belts that drive the water pump and alternator (closest to the engine), then the AC belt, then the power steering belt (closest to the fan). At a minimum you need to remove the power steering belt to install the AC belt. You may just want to replace them all while you're at it. The power steering pump, AC compressor, and alternator each have an adjuster bolt to loosen and tighten each belt (after the mounting bolts have been loosened). The procedure is to loosen the mounting bolts, turn the adjusting bolt CCW to loosen the belt, remove old belt, install new belt, tighten adjusting bolt, tighten mounting bolts. It's not to bad, but it can be a PITA to get a wrench on some of the mounting bolts if you haven't done it before. You do not need to remove the fan, the belts can be put over the fan blades.