I hear an intermittent high pitched chirping noise that comes and goes when I rev the engine?
• This could be caused by a bunch of things. First check whether all the belts are on tight enough, but also not too tight (there is a difference between a belt slipping, e.g., when you go through a puddle, and a bearing being over stressed). Remove all belts, and if the noise persists, suspect the drive belt tensioner. (You can actually feel it vibrate when it chirps, but don’t get your fingers stuck). They are easy and cheap to replace, see elsewhere for a replacement tensioning tool. If that’s not it, and the drive belt is not on too tight (see above) then you may be in trouble. • How do I know whether my water pump is going bad? • Obviously if it starts to leak either through the pump half seam or the bearing (the little hole on the bottom). However, there are also other failure modes you have to be aware of: If the car makes a grinding whish-whish-whish sound when cold
