Coolant Temperature Indicator
- Temperature bulb should glow when engine is cranking and when coolant temperature is above 270°F (132°C). If engine is cool and light remains on, disconnect Dark Green wire to sender (near A/C compressor). If lamp goes off, replace sender.
- If lamp stays on, lower steering column slightly and disconnect Dark Green wire from ignition switch. If lamp goes off, replace ignition switch. If lamp is still on, check continuity between sender and printed circuit. If wires are good, replace printed circuit. If lamp never comes on with engine cranking, check for blown "gauges" fuse.
- Disconnect Dark Green wire at sender. If lamp comes on, replace sender. If not, check bulb and printed circuit connector. If bulb and connector are good, lower steering column slightly and ground Dark Green wire at ignition switch. If lamp comes on, replace ignition switch. If not, make continuity check of Dark Green wire. If good, replace printed circuit.