First time D90 person here. 1987 D90 2.5L Petrol ... alternator belt went on me a few miles out from airport for business at 4AM ... went ahead and drove the last few miles as temperature stayed high but out of 'red' and had enough juice to still power the car. I had to run off to the flight for work and did not get a better look. I assume that the part is ETC7939. Does this single belt effect cooling (water pump) and the alternator to match the symtoms (12V batter light and car running hot). I will tow it back after arrival.

- Is this one serpentine belt? I cannot find a belt diagram. Is this two belts ... a water pump belt and a alternator belt?