Belts get narrower, dryer and slicker with age. If they werar down to hit the bottom of the V, they always slip. Slip also glazes the pulley, promoting more slip. All of these things add likely hood of squeal. Volvo's wierd acessory bushings don't help much either. That belt is old enough even a crap one will be better.
Sometimes wire bushing belts with the engine running will give them a few more weeks, but sometimes you lose your brush. Easier on cars without a mechanical fan usually.
The blower motor is also probably against you, it's a huge current draw, and since they are mounted in such a way as to water the bearing, in 740's they are never in good shape(at least they are easy to change).
Funny story, I took a ride in my friends all electric Chevy Spark which can monitor such things, and in town with heats and light, our power consumption was ~45% propulsion, 55% driver comfort.
Last edited by 745 TurboGreasel; 12-27-2014 at 09:42 PM.
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