Frontier is screeching on startup.

[TheKryptKeeper]

I did the belts, i don't know. I think that it might be a seized idler or something. Any help is welcome.

Krypt

[Big-Bird]

If the belts are wet at startup this can cause the problem too.

Make sure you don't have a coolant leak or fluid dripping on the belts from somewhere.

A bad idler should squeek all the time but stranger things have happened!

[Desert Rat]

Belts are probably not tight enough. I'd guess the one squealing is probably the alternator belt.

[TheKryptKeeper]

No, those are the first things I checked. There is a drain on power untill it stops squealing.

[Big-Bird]

I had a loud vibration coming from my Xterra when it was in gear but it didn't make the noise until the revs were around 3500rpm. The dealer thought it was the transmission at first. When they started to investigate the noise the tech had a hunch and removed one belt at a time and drove the truck each time. Once he pulled the alterrnator belt the noise went away. It turned out to be a pooched alternator bearing.

If you can't isolate the noise just by listening, you might have to do the same thing that tech did, remove one belt at a time and run the engine to narrow down where the noise is coming from. It's the cheapest and most effective way to locate the problem.

[hsckris]

what year is it? there is a TSB on the new models for the belt and one of the tensioners i believe. i need to have it done on my 06.

[nsrZ32]

^ Yep

We've done a lot of belts and Tensioners on the 4.0L xterras and frontiers. The tensioner pulley makes a nasty sound at start up.