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eldorado 98 dash sound

8K views 55 replies 9 participants last post by  mhamilton 
#1 ·
#10 ·
----------------------------
OK - so what DOESN'T work?

does changing the temp -
or selecting defrost - or heat -
or just shutting the entire system down change the noise -

does fan speed change the noise -

does it make the noise with key on - engine off -
or only with the engine running -
or only with the engine off -

the glove box is really quick/easy to remove -
pull it and getter a better/closer look/listen to what is making the noise -
 
#21 ·
wait a minute - something isn't right -

lets begin with the KEY ON - ENGINE OFF -
as long as it still makes the noise -

now turn the AC/heater blower ON to a low speed -

verify it makes the noise -

turn the fan speed higher - what happens to the noise -

leave the KEY ON - but turn the climate control system OFF -
what happens to the sound -

turn the climate control system ON - select a high fan speed -
describe the noise -

turn the ignition OFF - describe the noise -
 
#28 ·
wait a minute - something isn't right -

lets begin with the KEY ON - ENGINE OFF -
as long as it still makes the noise -

now turn the AC/heater blower ON to a low speed -

verify it makes the noise -

turn the fan speed higher - what happens to the noise -

leave the KEY ON - but turn the climate control system OFF -
what happens to the sound -

turn the climate control system ON - select a high fan speed -
describe the noise -

turn the ignition OFF - describe the noise -
Key on engine off- yes
Ac/heater blower at any speed - no
Engine on climate control off- yes
High speed climate control- no
Ignition off - no
 
#30 ·
Is the actuator for the blender door underneath the glove compartment.
Now that is getting warmer outside is starting to work balancing the A/C and hot air.
During the winter is most of the time in one position (hot). Now there is far more movement because the CCM is now moving it to balance the air temperature.
Remove the kick panel underneath the glove compartment and you will see it moving and hear the noise as it moves.
 
#32 ·
Judging from my experience, if it is a problem with the blend doors it will usually set a code. Try pulling the codes (see the sticky at the top of this forum) and posting them here along with the definitions.

You might want to check for someone's head "beatboxing" inside your glove compartment first. :)
 
#35 ·
If you have a vacuum leak, the blend door will not move properly, thus you get a code.
If there is no vacuum leak, and all you hear is a squeak of the door as it move then you won't get a code.
You have to make distinction between the kind of noise you hear, squeak or hiss.
 
#37 ·
My dash vents doesn't work properly either... when I turn on the fan on any mode or strength it ONLY flows to the front windshield defroster. I checked it about 3 times after I noticed and its the same. And to all ^^^^ this weekend ill take the glovebox out to find the source of the sound
 
#38 ·
The front defrost is the DEFAULT position if you have no vacuum. So is 100% sure in your case is a vacuum leak.
Before removing the glove box make sure your supply vacuum line (on the right side of the car going to the firewall) is intact, has no leak and the valve is mounted correctly (it only goes one way).
 
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