My F450 2010 class C motor home has the V10 engine. In the RPM range of about 2200 - 2300, there is a screeching sound I believe is from the engine area. It does not matter what transmission gear I'm in thus the vehicle speed is not a factor - only happens in that engine RPM range. Seems to happen when slowly accelerating/decelerating through the 2200 - 2300 RPM range or continues to screech if I maintain that RPM. If I drop back or increase RPM out of the range it quits. If I accelerate thru the range a little quicker it doesn't happen. Also does not happen when parked and the engine is sped up. Any thoughts?


Jim

 

Welcome to FTE duckwing.

My guess would be the idler or the tension pulley on the serpentine belt is worn. I replaced mine at 85,000 miles.

 

Does it change when you turn the air conditioner on or off?

My first thought was in the serpentine belt system, but that doesn't care if the truck is in gear or not.

 

I did not try AC ON/OFF but will.


Vehicle has less than 30,000 miles on it.


Thanks - Jim

 

My bronco blew the ac clutch out a while back and it would make a screeching sound when engaged, but it did it at all rpms.

 

My screech occurs only in the 2200 - 2300 RPM range. On the highway that is the RPM for 60 MPH. Right where my wife likes to drive.

 

Tell her to drive faster!

 

Usually that's not an issue but she has decided that's how fast the RV/tow vehicle should go.


Is that a HookEm smiley face.