Whistling sound... Any idea?

[Dddaviso7]

I hear a high pitch whistling sound when I have the heat on all the way. I hear it coming from the left of the drivers seat. Any ideas as to what causes that? It goes off when I turn it down 1 notch. Oh and I have a 1994 Ranger 2wd, 2.3l. Regular cab.


Any thoughts are much appreciated.

 

[pedal2themetal45]

There is a little vent hole in the cab might be a little pluged.. when the fan is on High its not venting all the prusher. if you crack one of the windows it well go away.
Tim

 

[preflight]

open your rear slide window and see if it goes away

 

[Dddaviso7]

I'll check and repost tonight.

 

[Dddaviso7]

Yeah, the sounds goes away when i crack a window. Where is the vent hole??

 

[pedal2themetal45]

The more I think about it there might not be a vent hole... Maybe in the rear sliding window... if you have one... might have to just crack a window when you turn it on high fan.. maybe not even crack just brake the seal a little.. your truck just might be to tight..
tim

 

[Dddaviso7]

I try to just keep it on fan level 3 when I need it. It's not really a big deal.
But I have after market speakers, so I can tune out the whistle if I have to, haha.

Thanks for the help.