Date registered: Nov 2006
Vehicle: '84 300DT, '97 S320
Location: Fayetteville, GA
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Similar symptom with my son's 2001 Volvo S80 T6. On the Volvo forums apparently lots of folks have the problem. A/C works fine for 10-15 min's, then compressor won't come back on until engine has cooled off for awhile.
There is a simple cause and fix for their compressors -- the clutch surface has worn, and when the engine and accessories heat up the clutch won't stay engaged. His gap between the pulley and clutch was almost .9mm, and the spec calls for no more than .35mm. We removed the clutch, and inside the center of the clutch is a depressed area that presses against the shaft, with some really small spacers/washers/shims, something like .8mm, .3mm and .1mm. Removing 1 or a combo of them reduces the clearance. I removed the .8mm shim, and now the A/C has been working for the last 50 days.
ALLDATAdiy shows that shims are used to correct the gap on our compressors also, in fact the diagram shows 3 shims. But it doesn't say if they are already there, and then you simply remove a shim or two like the Volvo. It would make sense for them to already be in there, because it makes no sense to have to add any, since that would only make the gap bigger.
Our gap is 0.5 ±0.15 mm. Buy a feeler gauge and check the gap. BTW, in case you don't know, this is not the same gauge used for gapping spark plugs, and most people don't have this kind, 'cause it's seldom used. This kind has about 20 or more thin strips of metal - mine goes from .88mm to some size ridiculously thin, like .04mm, which bends like paper. This kind is also used for adjusting valves on MB diesels, which is why I bought one 30 years ago for my 220D, and now used on my 300DT.
'73 220D White "White Knight" ('77-'06, 240K mi; floorboards rusted; gone to MB Heaven)
'84 300D Turbo Maroon "Raspberry" ('95-present, 375K mi; daughter named him)
'95 Merc Villager "Blueberry2" ('00-present, 252K mi-2nd engine-tip of crankshaft broke at 170K)
'97 S320 LWB Black "Ebony" (2010-present, 217K; bought at 204K mi)
'07 Dark-Green GMC Yukon Denali "Jade" (Added Apr 2011 - 104K)
Last edited by MB220D300D; 08-18-2010 at 10:40 AM.