What Causes the Noise from the Corolla's Belt Tensioner Pulley?
1 Answers
Tensioner pulley noise is caused by improper adjustment of the tensioner or aging of the belt. How to determine if it's the tensioner pulley making noise: To determine if the noise is from the tensioner pulley, you can only use the elimination method. Either remove the belt to check if the tensioner pulley is noisy, or replace it with a new belt and listen for any remaining noise. Possible other sources of noise: In winter, belt noise in vehicles is mainly due to the cold weather, which hardens the rubber and reduces its elasticity, causing slippage between the tensioner pulley surface and the rubber surface. Therefore, it's not about the belt being too loose or tight, but rather the rubber becoming too hard, reducing friction and causing slippage, which results in noise.