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Re: Loud Noise in Central Dash area, 2000, F-150,,Sounds...
Have you checked to see if the heater motor is ok. Sometimes the newer ones have a bearing in the end by the plastic fan and the bearing will allow the fan to drop down and cause a loud noise when running. To check turn off the heater motor fan on the dash and see if the noise goes away.
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Does this happen constantly or only when you have the cabin a/c or heater fan blowing? Do you hear it when the vehicle is running but not moving? I suspect that something fell down into one of the windshield defroster vents and is rattling around inside the blower fan cage.
check to see if there's anything loose underneath the car that could get pushed into your tires as you speed up it happened to me it was the wheel well plastic guarding that was torn off and hitting the tire at faster speeds.
Yes, common problem the plastic cowl at the base of the windshield warps and the resultant air turbulence caused makes a howling noise especially in the 55-65 speed range. Most dealers will just tack the cowl with silicone adhesive at the area that is warped. Just look for an area where the black plastic cowl is not tight against the base of the windshield. Do not buy a new cowl as it will warp again causing the same problem to recur.
I do not think that the battery change and the noise for the a/c is related, probably just a coincidence.
If the a/c makes a loud noise when it is turned up, I would try switching to vent to see if the noise is still there. If it is, then it is the ventilation fan likely located on the firewall or under the dash under some plastic paneling.
Sounds like the fan needs to be replaced. But first, to check for obstructions, remove the carpet liner from the underside of the dash on the passenger side and you'll see the blower motor under the dash held in with three screws. If there's something obvious blocking it, remove it and reinstall the fan. If there's nothing blocking it, then you'll probably need to replace the fan. Any auto parts store, Rockauto.com or E-Bay will have the correct fan for your Grand Prix.
Concerning your broken vent -- this can be caused by a broken linkage or a malfunctioning servo motor as well. these vent have air ducts the sway back and forth to adjust the dual air flow function. if the servo o linkages are malfunctioning or not connected for some reason, it will not allow total control of the air flow and temperature range. Now, if you have a combination of a flow error and temperatureerror as well, thai can be caused by a combination of the two.
In this case, you will need to inspect the linkages as well as the servo motor function as well. in addition, i would test the air temp sensors for there operational value. they control the temp when you adjust the coll or hot function.
Concerning the Loud noise coming from the blower fan---
This issue can be caused by a misalignment within the blower housing or, it can also be caused by some minor damage within the motor itself, causing it to rotate in a erratic manner, in return, forcing it to rub against the housing itself. the best solution here is to extract this blower fan housing and inspect for lose fan propeller and motor stability. replace parts accordingly.
Is the noise that you hear a loud "humming" nosie? If so, I need you to remove the lower panel, under the glove box, (if it has one), and remove the 3 screws that hoilds the heater fan to the plastic box. After removing the fan, inspect the fan and inside the box for debris. Most likely, you will find some type of debris contained in the fan blades. This is very common, I drop 2-3 fan motors a week around this time of year. You may also find a rodent nest in the fan area.