whistle noise with blower fan

[spderjhn]

My blower motor on the ac whistles louder and louder as fan speed increases. Anybody know what causes this? or better yet has fixed it

[Tarheel_6.4L]

The last time I had a whistle, it turned out to be a hole in my intercooler.

[allevil]

I thought my Blower Motor had a Whistle to it too. Like the last couple speeds.

Turned out, I had the Dash Vents Closed on the Passenger Side.

I only use the Driver's side when I'm alone.

Opened them Up and the Noise went away.

Try it and see. Hope it helps.

[spderjhn]

been through the whole vent closed thing. It is still doing the same thing that increases when fan speed increases

[jrod80]

I noticed a whistle in mine and it was because I took the rear vents out from behind the back seat and dynomated over the hole. My subs were making them rattle. Without the rear cab vents it creates pressure causing the whistle. As soon as I cracked a window or the rear slider it went away. I need to poke some holes in the dynomat or something I guess. lol