I have a 2001 F350 Super Crew Long Bed With the 7.3 Power Stroke Diesel. Recently while towing my 5th wheel trailer I started getting this loud squeel noise from under the dash when I reach around 65 MPH. At first I thought that it was feedback through the radio, but I disconnected the radio and I still get this noise. Some times it's louder than others but almost always it's there.
Loud Squeel Noise Under Dash
- Thread starter Rick S
- Start date
Tail_Gunner
CRJ & ERJ A&P Mech.
Vacume leak/whistle from the HVAC?
Blower fan motor going bad?
It can't be the speedometer, it's electronic, no old style speedometer cable.
Blower fan motor going bad?
It can't be the speedometer, it's electronic, no old style speedometer cable.
Squeal Noise
I wish it were that easy, this noise is loud and if I slow down to 62 or less it goes away. Really sounds like feed back through speaker accept that it in the dash somewhere.
By the way I was a B-52/KC 135 Crew Chief for 16 years "D-G" models.
I wish it were that easy, this noise is loud and if I slow down to 62 or less it goes away. Really sounds like feed back through speaker accept that it in the dash somewhere.
By the way I was a B-52/KC 135 Crew Chief for 16 years "D-G" models.
Tail_Gunner
CRJ & ERJ A&P Mech.
Does it happen all the time or just when you've got the 5'er in trail?
roosterdiesel
Earl needs B100
Rick S said:
Welcome to SDD!
Could it be a boost leak? Do you have gauges? ANy performance loss?
Once when I left the orange boots on the plenums completely loose they would sound like a high pitched squeal at high boost levels. Didn't do it at low boost levels.
Tail_Gunner
CRJ & ERJ A&P Mech.
Does the squeel just start at a certain MPH? Or does it vary depending on if you have a headwind or tailwind?
Does it vary at all with vehicle speed or engine rpm, or maybe even transmission gear?
For the most part, I'm thinking air or vacume leak.
Does it vary at all with vehicle speed or engine rpm, or maybe even transmission gear?
For the most part, I'm thinking air or vacume leak.
Rex-a-FORD
Full Access Member
Have you added or repositioned anything on the outside of the truck. Maybe change d or added an antenna. Anything that would affect airflow over and around the cab.
If so, you may have created an area where a harmonic could develop and create the noise your hearing. I know ya' said it was coming from under the dash, but vibration noises can be transmitted a long ways in these vehicles.
If so, you may have created an area where a harmonic could develop and create the noise your hearing. I know ya' said it was coming from under the dash, but vibration noises can be transmitted a long ways in these vehicles.
