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you need to relase the tension pully to allow you more room for changing belt once done hold the pully tight by using a metal bar or pipe while tightning the nut ADD - Going from my 1990 layout, which is similar (i think) to the 91, you need to loosen the bolt facing up (between engine and alt), but you also need to loosen the front of the idler pulley. The front bolt locks the pulley down. DONT OVERTIGHTEN. A new belt is 140-180 lbs tight, or 110-150 for used using a belt tension gauge. If you overtighten, you will stress the rubber ring in the harmonic balancer (crank pulley) and it will eventually give out. ($120 for a new one in 2009)

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Q: How do you change the AC belts on a 1991 Corolla?
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