Reper the front light glass scratching - 300-Class Mercedes-Benz Cars & Trucks

talk with a glass services as to products and procedures for removing scratches in glass

Drivers window usually gets much mre use than the others, so some internal part is worn or has come loose. If you know how to remove door panel you may be able to figure out what is wrong, or get a body shop to fix/adjust the glass.

Try to clean dirt sand.

if its not a deep scratch auto parts stores sell a glass repair kits for this all you need is a power drill

Replace the glass

A scratch is material removed &
can not be fixed or put back

usually this means you need a new window regulator.

Section 01-11: Glass, Frames and Mechanisms 1997 Crown Victoria, Grand Marquis Workshop Manual
REMOVAL AND INSTALLATION Window Regulator, Power Front Door
Removal

1. If front door window glass (21410) is in the down position and is inoperable, the following steps must be taken; if front door window glass is operational, go to Step 2.
   
1. Remove front door trim panel (23942) and front door trim shield (237A04). Refer to Section 01-05 .
2. Disconnect battery ground cable (14301). Refer to Section 14-01 .
3. Disconnect window regulator electric drive harness connector.
4. CAUTION: Be careful not to strike or scratch front door window glass because it can break.
   Remove window regulator electric drive retaining screws through holes.
5. Remove window regulator electric drive (23394) from front door power window regulator.
6. Raise front door window glass to full up position by hand and secure with tape.
7. Go to Step 5.
   
   
2. Remove front door trim panel and front door trim shield. Refer to Section 01-05 .
3. Remove front door window glass as described.
   
4. Disconnect window regulator electric drive harness connector.
   
5. NOTE: Use care not to enlarge sheet metal holes in the door inner panel.
   
   Remove two 1/4-inch rivets retaining lower bracket of front door power window regulator to inner panel. Use drift punch to knock out center pins for each rivet. Using a 1/4-inch diameter drill, drill out remainder of rivet.
   
6. Remove three window regulator electric drive retaining screws from inside door to remove window regulator electric drive from front door power window regulator.
   
7. Remove two window regulator retaining nuts.
   
8. Remove front door power window regulator from front door (20124).
   

Installation

1. Lubricate regulator mechanism with Teflon® Lubricant E7FZ-19590-A or equivalent meeting Ford specification ESB-M1C111-A.
   

1. Install front door power window regulator minus motor (23208) into access hole in inner panel.
   

1. Position front door power window regulator using upper studs and tabs on window regulator electric drive mounting bracket.
   

1. Install rivets retaining front door power window regulator to door inner panel (1/4-20 x 1/2 inch screw and 1/4-20 nut and washer assemblies or equivalent metric fasteners may be used).
   

1. Install two upper front door power window regulator retaining nuts.
   

1. Install window regulator electric drive with three screws. Do not overtighten screws.
   

1. Connect the window regulator electric drive harness connector.
   

1. Install front door window glass.
   

1. Adjust front door window glass as described.
   

1. Install front door trim shield and front door trim panel. Refer to Section 01-05
   

Most of your Auto Parts stores stock a glass and plastic polish for about $10. to $20...Sometimes this polish will do the job...depending on the depth of the scratch, another option...many glass replacement shops will perform a machine polish on the scratch in an attempt to clear it. Hope this helps.

Lamps, Parking Front Lamp-Lamp Assembly, Taurus
Removal and Installation

1. Remove Headlamp (13008) as outlined.
   

Headlamp Assembly
Removal and Installation

1. WARNING: THE REPLACEABLE HALOGEN HEADLAMP BULB CONTAINS GAS UNDER PRESSURE. THE HALOGEN HEADLAMP BULB MAY SHATTER IF THE GLASS ENVELOPE IS SCRATCHED OR THE HALOGEN HEADLAMP BULB IS DROPPED. HANDLE HALOGEN HEADLAMP BULB CAREFULLY. GRASP HALOGEN HEADLAMP BULB ONLY BY ITS PLASTIC BASE. AVOID TOUCHING GLASS ENVELOPE. KEEP HALOGEN HEADLAMP BULB OUT OF REACH OF CHILDREN.
   Position headlamp switch (11654) and headlamp time delay switch (13736) in the OFF position.
   

1. Remove two bolts retaining headlamp (13008) to upper support assembly and loosen pinch bolt. Remove headlamp assembly from vehicle.
   

1. Remove park lamp bulb and socket (Sable only) and headlamp bulb and socket from Headlamp Assembly as outlined.
   
   
   Headlamp Assembly (Taurus Shown, Sable Similar)
   
   
   
   

1. Turn lamp socket and wiring (13410) assembly 1/2 turn counterclockwise and remove from parking lamp (13200) housing.
   

1. Remove screw from park/turn signal housing.
   

1. Using 1/4 inch drive socket extension and swivel, insert tool through two access holes in upper radiator support. Remove screws from park/turn signal housing.
   

1. Remove parking lamp from vehicle.
   

1. To install, reverse Removal procedure.
   
   
   Front Lamp-Lamp Assembly, Taurus
   
   
   

Hello.
The rear defroster isn't affected by a/c operation.
The most common issue I see in my shop is the rear grid damaged.
The wire you see in the rear glass is a resistor type conductor which builds heat as electricity passes through it. If the grid wires get scratched it is like a broken wire and will not build up heat as there is an interruption in the flow.
First thing is verify your fuses are good and the indicator light comes on when the switch is depressed.If they are OK proceed to the next check.
If you look carefully at each side of the glass there is a wire connected to the grid. If these have come loose or become corroded that is where your problem has most likely occurred.
To test it a 12 volt test light or a multimeter should light or read battery voltage applied at each side of the glass grid.
If indeed the grid is damaged there is a repair kit available to fill in the gap at your local auto supplier.
Hope this helps you with your repair.

First, keep in mind that as you begin to remove these doors you run the risk of causing serious scratches to the paint and glass, so put some masking tape and/or plastic sheeting around both sides of the door (rear quarter panel and rear glass, front door and front door glass)
I would get a Haynes repair guide since that's what I have to work from and it will tell you step by step with pictures, what to do. It's not hard, but you need to get all of the attach points unhooked to be successful. Suggest you have a helper working with you to keep the door steady.