NOW. These cars are notorious for timing belts snapping and GM has advised to replace at 60K. I have this car and it has an interference engine, meaning that if the belt snaps there is a good chance the engine's pistons will bend the intake/exhaust valves, meaning you would have to have the engine rebuilt if this happens.
I am about to have mine changed, along with the water pump and tensioner since the water pump should be replaced before 100,000 and involves the same labor. I've found that at a Chevy dealership the whole package ranges from $500-$800 depending on who you call.
On a vehicle with a serpentine belt system there is always a tensioner pulley. Usually in the center of the routing network, you need to place the correct size wrench on it and push or pull with one hand releasing the tension on the belt. With the tension released, use the other hand and slip the belt out. Most vehicles have a sticker in the engine compartment for replacing the belt to be sure it is put back in correctly. If not, be sure you look at the routing and or draw a picture so that it is replaced the same.
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