If the air conditioner compressor has seized could this prevent the car from starting?
Yes. Removal of the belt would allow the engine to start if this was the case.
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ACCESSORY DRIVE BELT TENSION
The accessory drive belt tensions listed below does not apply to systems with automatic belt tensioners. Belt tension listed in the belt tension charts are typical and should only be used as a guide.
On models equipped with Delco-Remy CS130 or CS144 alternators, exceeding 100 lbs., of drive belt tension could result in damage to the alternator.
When installing drive belts, the belt must grip the entire contact area of the pulley. Always install the proper size belt conforming to vehicle manufacturers specifications. Accessory drive belts must also be set to the proper tension.
When the drive belts are too loose, they may slip, tear, burn or grab and snap. Drive belts which are too tight may cause damage to the engine by causing side loading of the crankshaft, crankshaft bearings and accessories or accessory bearings. Too much tension will also stretch and weaken a drive belt. Accessory drive belt tension can be inspected using a suitable drive belt tension gauge. To inspect drive belt tension, place drive belt tension gauge at the center of the greatest belt span.
On models equipped with automatic accessory drive belt tensioners, the belt tension will automatically be set by the tensioner. Some tensioners incorporate a tension indicator band. If the belt tensioner indicator is not within the band limits, the drive belt may need to be replaced.
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