2008-2013 Cadillac CTS Performance Mods Discussion, engine noise when idling in Cadillac CTS Second Generation Forum - 2008-2013; Greetings
The 2011 CTS 3.6 is new to me. I noticed when the car is idling there is what sounds ...
The 2011 CTS 3.6 is new to me. I noticed when the car is idling there is what sounds like a belt noise coming from the front of the engine. The CTS has 40,000kms on it. Are the serpentine belts on the 3.6 noted to get noisy?
tensioner and idler pulley would be where I would look first.....remove the belt and turn the pulley feeling for a rough bearing/race. If not silk smooth, then replace. If not those, water pump would be next and then AC compressor.