Thunderbird/Cougar
1989 Thunderbird/Cougar
36-86-2 Window, Rear-Defroster 36-86-2
DESCRIPTION AND OPERATION (Continued)
TESTING
Control Assembly Tests
1. Ground pin 4 and connect a jumper wire between pins 2 and 3. Connect a 12-volt test lamp between pin 1 and ground.
2. Apply power to pin 2. The test lamp should not light.
3. Apply power to pin 5. The heated rear window symbol on the switch should light up.
4. Momentarily actuate the rocker switch to the ON position. The test lamp should come on and stay on after rocker switch returns to the normal position.
5. Test lamp should go off under any one or more of the following conditions:
a. If rocker switch is moved to the OFF position.
b. Jumper wire between pins 2 and 3.
c. Approximately 10 minutes have elapsed.
1989 Thunderbird/Cougar
36-86-3 Window, Rear-Defroster 36-86-3
TESTING (Continued)
Grid Wire Test
1. Using a strong lamp inside the vehicle, visually inspect the wire grid from the outside. A broken grid wire will appear as a brown spot.
2. Run the engine at idle. Set the control switch to ON. The indicator lamp should come on.
3. Working inside the vehicle with a 12-volt DC voltmeter such as Rotunda Digital Volt Ohm Meter 007-00001 or equivalent, contact the broad red-brown strips on the rear window; positive lead to battery side and negative lead to ground side. The meter should read 10-13 volts. A lower voltage reading indicates a loose ground wire (pigtail) connection at the ground attaching screw.
4. Contact a good ground point with the negative lead of the meter. The voltage reading should not change.
5. With the negative lead of the meter grounded, touch each grid line of the heated rear window at its midpoint with the positive lead. A reading of approximately 6-volts indicates that the line is good. A reading of 0-volts indicates that the line is broken between the midpoint and the B+ side of the grid line. A reading of 12-volts indicates that the circuit is broken between the midpoint of the grid line and ground.
REMOVAL AND INSTALLATION
Control Assembly
Removal and Installation
1. Remove instrument panel trim panel.
2. Remove electrical connector from control assembly.
3. Push on connector base of control assembly to push control assembly out of trim panel.
4. To install, reverse Steps 1, 2 and 3.
Window
Disconnect wire leads at each end of the glass. Remove window. Refer to Section 43-11.
MAJOR SERVICE OPERATIONS
Grid Wire Repair
Note: A single break or any breaks that total more than 25 mm (1 inch) in one grid cannot be repaired. The window must be replaced. For breaks less than 25 mm (1 inch) long, use the following procedure:
NOTE: If the first layer of the heated rear window grid (brown color) is damaged or missing, it will be necessary to apply brown Acrylic Lacquer Touch-Up Paint AL81-5477-B (ESR-M2P100-B) or equivalent on the glass prior to applying the silver Grid Repair Compound D8AZ-19562-A (ESB-M4J58-A) or equivalent. Inoperative grid wires on heated rear windows should be repaired by using Ford Grid Repair Compound D8AZ-19562-A (ESB-M4J58-A) or equivalent.
Surface Preparation
1. The vehicle should be brought inside and permitted to come to room temperature of 16~C (60~F) or above.
2. Clean the entire grid line service area with Ultra Clear Spray Glass Cleaner E4AZ-19C507-AA (ESR-M14P5-A) or equivalent to remove all dirt, wax, grease, oil or other foreign matter. It is important that the repair area be clean and dry.
CAUTION: Do not use scrapers, sharp instruments, or abrasive cleaners on the interior surface of the rear window, as this may cause damage to the grid lines.
Mixing The bottle of Grid Repair Compound D8AZ-19562-A (ESB-M4J58-A) or equivalent and touch-up paint (if needed) must be at room temperature. Shake bottle for at least one minute for thorough mixing. Shake frequently during use.
Application
1. Mark location of break on the outside of the window.
2. Using cellulose tape, mask off the area directly above and below grid break. The break area should be at the center of mask, and tape gap must be no wider than the existing grid line.
3. Apply the repair coating in several smooth continuous strokes (allowing three to five minutes drying time between coats) across the break area using the brush applicator in the cap. Extend the service coating at least 6.35 mm (1/4-inch) on both sides of the break area. If both brown and silver layers of the grid are broken or missing, apply a coating of the brown touch-up paint across the break area first. Two coats may be necessary to obtain the proper color. Allow the touch-up paint to dry, then apply three coats of silver grid repair compound allowing three to five minutes drying time between coats. The coating of the silver grid repair compound should extend at least 6.35 mm (1/4-inch) on both sides of the break area.
4. Allow to dry for five minutes, then remove the mask.