My '97 Deville driver side rear view mirror is looking partly "bronze" and partly "silver". It is now rather difficult to see a clear image in it. What could be the problem?

Look in the fuse box for the fuse it will likely have other things on it but nothing to high voltage .
Pull the fuse and see what happens .
Honestly I have never heard of this .
Unless the mirrors lit or damaged somehow from to much heat damaging the coating on the back of the glass making it not a mirror any more .
This sounds like a factory defect

Use the on/off (left) button on your rearview mirror. Unfortunately, this will also turn your compass off.

I would first take the mirror apart to make sure the cable is still attached. Then if it is I would soak the cable with penetrating oil and put it back together and hope for the best.

It depends on WHICH PART of the OnStar system you want to know about....

> The control unit is located in the rear view mirror assembly

> The Vehicle Communication Interface Module (VCU or VIU) is located behind the rear seat back

> The Celular Telephone Module depends on whether your vehicle is equipped with GPS: With GPS it is located under the right side of the rear package shelf. Without GPS it is located behind the rear seat back.

Auto parts stores sell "Rear view mirror adhesive" - special glue for mirrors. TIP: Follow instructions to the T or you'll be doing it over.

I am assuming you are talking about the interior rear view mirror and not the side rear view mirror. Most auto parts stores sell an adhesive glue to fix the interior rear view mirror. Most of these mirrors have two parts to them. One part is the bracket that glues to the windshield and the other part is the rear view mirror assembly. Before gluing the bracket to the glass check and see how the mirror assembly attaches to the bracket. There will often be a screw that fixed the two together.

for radio

Visual Inspection Chart Mechanical Electrical

• Audio unit
• Antenna or antenna cable
• audio speakers mounting/speaker cones
• Radio ignition interference capacitor, radio frequency interference suppression bond

• Central junction box (CJB) fuses:
  • 19 (10A)
  • 12 (5A)
• Battery junction box (BJB) fuses:
  • 19 (40A)
  • 20 (40A)
  • 27 (10A)
• Connectors
• Ignition switch
• Circuitry
• Audio unit

for mirrors

Visual Inspection Chart Mechanical Electrical

• Exterior rear view mirror(s)
• Interior rear view mirror

• Central junction box (CJB) Fuse(s):
  • 8 (10A)
  • 16 (10A)
• Circuitry
• Exterior rear view mirror motor(s)
• Exterior mirror control switch
• Heated rear window switch

are you trting to tighten the mirror glass or the mirror where it attaches to the body? I don't think glass is removable in 99. Only can try to press on glass to seat if unseated. not too hard.

1. Remove the front door trim panel; refer to Section 501-05 .
2. go to car-part.com for a used mirror. Page with * is cheapest seller.

1. Remove the speaker.
   1. Remove the screws.
   1. Disconnect the electrical connector.
   1. Remove the speaker.

1. Remove the outside rear view mirror (17682).
   1. Disconnect the power mirror wiring clips.
   1. Remove the outside rear view mirror nuts.
   1. Remove the outside rear view mirror.
      • Feed the power mirror wiring through the opening in the front door (20124).

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SECTION 501-09: Rear View Mirrors 2001 Explorer/Mountaineer Workshop Manual
REMOVAL AND INSTALLATION Exterior Mirror Glass, 2001 model Removal
NOTE: Exterior mirror glass is serviceable only on vehicles built after July of 2001.
NOTE: Passenger side exterior mirror shown, driver side exterior mirror similar.
All mirrors

1. Position the glass in the full up position.

1. Locate the notch at the bottom of the exterior mirror glass.

1. Release the exterior mirror glass.
   1. Insert a long flat-bladed screwdriver in the notch.
   1. Push the screwdriver into the notch until the glass is released.

Heated mirrors

1. Position aside the exterior mirror glass.

1. Disconnect the electrical connectors.

All mirrors

1. Remove the exterior mirror glass (17K707) passenger side or (17T675) driver side.

Installation
Heated mirrors

1. Connect the electrical connectors.

All mirrors

1. Position the exterior mirror glass on the exterior mirror motor.

1. Place a hand against the back of the exterior mirror housing and a hand flat against the exterior mirror glass. Press the glass in place until fully seated.

SECTION 501-09: Rear View Mirrors 2001 Villager Workshop Manual REMOVAL AND INSTALLATION Mirror —Exterior Rear View Removal

1. Remove the front door trim panel. For additional information, refer to Section 501-05 .

1. Remove the upper speaker.
   1. Disconnect the electrical connector.
   1. Remove the bolts.
   1. Remove the speaker.

1. Position the watershield aside.

1. Remove the exterior rear view mirror access panel.

1. Disconnect the exterior rear view mirror electrical connectors.
   • Release the wiring harness locator.

1. Remove the exterior rear view mirror.
   • Remove the bolts.
   • Feed the wiring harness through the door opening.

There are two tiny motors in each mirror. one for up/down. One for side to side. They have jack screws (plastic) that fit into the motors.

You can manually put your hands on either side of the mirror and force adjust it. If you hear a ratcheting sound, the jack screws are OK. Then repeat with hands on top and bottom.

If you hear ratcheting and mirror stays where you stop it, that means one of the motors is bad. The motor assembly is available as a separate part.

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Mirror Motor—Crown Victoria, Grand Marquis
Removal and Installation

1. Disconnect battery ground cable. Refer to Section 14-01 .
   

1. Remove outside Rear View Mirror Glass as outlined.
   

1. Remove Outside Rear View Mirror as outlined.
   

1. Remove two screws from outside rear view mirror motor.
   

1. Remove outside rear view mirror housing from outside rear view mirror base.
   

1. Disconnect connector and remove outside rear view mirror motor from mirror housing.
   

1. To install, reverse Removal procedure.
   

Might be cheaper to buy used irror at car-part.com. Look for * to find page with cheapest part. Or, EBay. Good luck