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If the idler and nearby pulleys are all in-line, not excessively worn and the axis is exactly at a right-angle to the belt run the belt should not pop off, therefore either the idler or other pulleys are worn tapered or sagging or it is possible the belt has become stretched on one edge.
You could try turning the belt around so it is traveling in the opposite direction and see if it makes any difference. Some idler pulleys will also turn round if required.
i would check your tensioner and idler pulley. you may have a bad bearing and its dragging the belt causing friction which then creates the burning belt smell. remove your serpentine belt and spin all pulleys by hand p/s, alternator, water pump, tensioner, idler, a/c. if the pulley is stiff or feels rough then thats the component at fault and you would need to replace that certain component and its also best practice to replace your belt now too.
Not likely. Idler pulleys are only for routing of the serpentine belt. If one of your "pulleys" is leaking coolant its likely the water pump, which also has a pulley on it. The smoke is probably leaking coolant burning off a hot part of the engine or exhaust system.
yes, if it is frozen up the belt will squeal and burn up ! you can go to any auto parts store and tell them you need a idler pulley for your vehicle. good-day !
A burning belt usually indicates a seized idler pulley on those gm cars. You will have to find which pulley is seized and change, it before replacing the belt or the new belt will only burn and snap again.
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