Hey Guys!

On my 04 D2 theres is a apparent whining noise.

The whining noise is the loudest when
- AC Is On at the lowest blower speed
- When breaking hardest

The whining noise goes away when
- AC is Off
or
- When given gas

The whining noise lessens
- Higher blower speeds

Do you guys no what this could be?
I figure it has to do with the AC some how, quite confused on why its louder when breaking hard and when the AC is on the LOWEST setting.

Thanks Guys

 

Trash in your AC fan is shifting by momentum. You should try to remove the AC blower (it drops down by a few bolts) and clean it out. We have had pix of ones with leaves, straw, hood blanket chewed off by rodents, etc. RAVE sheet attached.

And from the RAVE, we now know the offical Rover-speak for the cardboard under the glove box it is the "toe board".

 

Might also be the bearings on the blower motor. Assuming debris is not found in or around motor wheel, most likely the transfer of weight while braking is causing the bearings' load to change.

My blower motor sounded like a hyper cricket. I could turn it to high to make the noise go away, and like you: sometimes would only make noise when coming to a stop.

I pulled my motor apart and oiled both bearings with 3-in-One oil because I didn't want to spend the money on a used one, certainly not a new one. After the bearing lubrication, it has been quiet for several months.

 

What those guys said.

 

I like the bearing issue, because it would be less noticed at high speed (the whine may shift frequency to above human hearing), for the present time. Either way, out with the fan.

 

Looks like I should be able to diagnose both of those issues at the same time, correct?

I'll take a look at it tomorrow when the sun rises.

Thanks Guys

 

If I remember correctly from when I pulled my blower motor, I was able to reach up into the HVAC ductwork and feel at least one door. With someone's help, or extremely flexible arms, you might be able to change temperatures from high hot to low cold, and feel if the door in the HVAC moves to block or engage the heater core.

 

Do you think it might have to do with the serp belt or any of the pulleys?

 

If the noise happens, or gets worse when braking, and goes away as blower fan speed is increased, no. That noise has nothing to do with belt or pulleys. Of course, you could have another noise from belt/pulleys, but braking and fan speed increase wouldn't change it, only RPM increase/decrease.

 

You can "listen" to each thing the belt turns with a stick pressed against your ear and the object. The solid stick conducts sound better than air, and you will hear things you can't hear normally over all the surrounding noise. Important safety tip - use a longer stick to avoid hair being caught by belt.