Quote:
Originally Posted by i82much
spray it with belt dressing, might help diagnostically.
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DO NOT contaminate the belt with "belt dressing".
Spray it with WATER for diagnostics. The water will kill the squeal of a slipping belt (temporarily) but not damage the belt or leave residue.
Air expands under vacuum.
If you put 28 inches of vacuum on the system, and you don't suck out a bunch of fluid when the air bubble farther down expands...you don't have an air bubble in the system. There is no air.
And LOOK at how the belt fits the groove. Aside from incorrect-width belts, I've seen worn V-groove pulleys where the "V" has eroded to a "U". No belt will work on that pulley.
If this is a serpentine system, did the morons who designed it allow for sufficient belt-wrap on the PS pulley, water pump, alternator, etc? The "engineering" I see on aftermarket serpentine systems is terrible.
IF (big IF) it turns out that the fan/fan clutch has too much drag on the water pump pulley, and there's plenty of belt wrap, maybe the air fins of the radiator or A/C condenser are folded-over or filled with dragonflies or sparrows. Fan works too hard pulling air through the rad.