Guess the sounds coming from my 1mz

[Fresco Bob]

These are coming from a '99 1mz Manual

Sound #1: When I hit around 2900 RPM, there is a slight 'buzzing' sound coming from the engine bay. The faster the rpm's climb, the shorter the sound, and its longer if Im accelerating slower. The buzzing almost reminds me of a kitchen buzzer, but I can only get it to last about 1-2 seconds. Anybody know what it is?


Sound #2: This one is related to the HVAC fan. When the fan is on with the AC, doesnt matter if its the low of high setting', I get a whinning sound that gets louder as the rpms get higher. Its somewhat noticable with just the fan on, and very noticable with the AC on as well. Anybody know what this is to? Thanks

[marc780]

#1 sounds like you have a loose part in the engine someplace - try tightening some bolts under there. It's also possible it could be a loose belt, or the alternator fan is a little warped; or an idler pulley or other timing belt component that needs replacing. There's a hundred things it could be after all; If you cant duplicate the sound with the hood open then i wouldn't worry about it too much, as it will either get louder (making it easier to find it) or stay the same.

As for #2 it sounds to me like you have a bad motor or blower fan on your interior (HVAC) fan. Maybe some piece of the fan is broken off or the fan itself is warped and wobbly. I'd change the motor and the fan.