Can't get my new AC belt to stop squealing
 

05 Coupe

The belt is new and the tensioner + pulley was used off another G but was in good condition. My old tensioner wouldn't tighten enough.

Anyway, during a cold start the belt chirps for a second and goes away. But if I switch the AC on it squeals like hell and only goes away when I accelerate for a little and let the belt stop slipping.

Pushing on the belt it doesn't have too much slack. I've went back and tightened it 3 times. It feels tight enough. But I guess I'll have to go back and try again. Any ideas? Maybe an actually new tensioner and pulley this time?

Get a cheapo tension gauge off amazon and set the belt at factory spec, it's really hard to guess the tension and too tight is as bad (or worse) as too loose.

I've found dayco belts suck... might want to try a different brand if that's what you're using. They slip like crazy from day 1 but last a long time.

Factory tension is pretty tight.The tensioner pulley is simply a bolt and should not go bad, unless the bearings are shot. Did you loosen/retighten the pulley nut when making adjustments?

One thing you can count on from Nissan is good rubber parts, replacing belts and wiper blades that's where I get them! The previous posts are also a possibility, tensioner and tightness...Gary

When I would loosen the pulley nut even a tiny bit, the entire pulley would fall to the lowest position with no effort. And wouldn't tighten nearly enough. The "new" one I got solved this problem but I'm gonna go tighten it some more and see what happens.