[Silver 09]

I have this 2009 with 175K miles that runs great. Sounds good until the temperature gets 1/2 way up then it starts to whistle. Consistant and steady even after reaching normal temps. This is way before the fans come on and even then they don’t change the sound. If given a little throttle up to 1000 rpm or above the sound goes away until engine is reduced back at idle.
Where to start to look and or spray something to see if it would be a vacuum leak? Almost like metal to metal except just adding a few rpm’s and it goes away. Makes me feel it may be vacuum, not metal.

Thanks in advance for any help

 

[ssncob]

I'm thinking waterpump bearing...

 

[Silver 09]

I'm thinking waterpump bearing...

Thanks, as it warms up it could be the one. Good starting point.

 

[mbazzy123]

Do you see any evidence of the water pump seal leaking ?

 

[mbazzy123]

Thanks, as it warms up it could be the one. Good starting point.

Thanks, as it warms up it could be the one. Good starting point.

Thanks, as it warms up it could be the one. Good starting point.

When I was re-assembling my engine after a out of frame repair I had a whisteling vacuum leak, it was the emissions canister directly under the front lower cowling. The culprit was a cracked vacuum line (the larger of the 2) I snipped it off reconnected it and no whistle. Might be worth a look.

 

[Dn]

Alternator Drive Gear, ADG, could make the sound like that. I hope that is not the problem.

 

[pwhoever]

Alternator Drive Gear, ADG, could make the sound like that. I hope that is not the problem.

I thought that was more of a problem with the 01-05 and that the gear was redesigned for the 06-up?

 

[mbazzy123]

I do believe the ADG drives were redesigned 06 and up. If the water pump is leaking at the weep hole most likely that bearing is the culprit.

 

[gdb069]

My VT1100C2 has started whistling at idle after a ride. One way to determine is to use a stethoscope to isolate. Poor man's version is a screwdriver handle to your ear and the business end touching various engine areas. Yup it is my waterpump although no leak.

 

[Silver 09]

I have this 2009 with 175K miles that runs great. Sounds good until the temperature gets 1/2 way up then it starts to whistle. Consistant and steady even after reaching normal temps. This is way before the fans come on and even then they don’t change the sound. If given a little throttle up to 1000 rpm or above the sound goes away until engine is reduced back at idle.
Where to start to look and or spray something to see if it would be a vacuum leak? Almost like metal to metal except just adding a few rpm’s and it goes away. Makes me feel it may be vacuum, not metal.

Thanks in advance for any help

Sorry I didn’t get back to all who replied. Yes it was the water pump. Replaced pump and all is well.
Thanks for the info

 

[Captron]

Sorry I didn’t get back to all who replied. Yes it was the water pump. Replaced pump and all is well.
Thanks for the info

Silver/ Thanks for getting back to us, and what caused your whistle

Ronnie
8/8/25