I replaced both the tensioner and idler on mine sometime last year, wasn't chirping "yet" but I could hear the noisy bearings, funny I can hear when something sounds different even though I blast my radio so loud it hurts my ears sometimes.Mine chirps like a bird I think it's one of the idlers or the belt is worn (it's the original belt it slips sometimes on a cold start) it's not a HUGE deal as it runs the water pump only it has an AUX electrical water pump as well..