Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1983 Jaguar XJ6 BaseFACTORY OEM SERVICE PROCEDURE
THERMO Time Switch
- Using a thermometer, check engine coolant temperature. Compare coolant temperature with value stamped on thermo time switch body. Connect an ohmmeter between terminal "W" on switch and ground.
- If coolant temperature is higher than switch value, a very high resistance denoting an open circuit should be obtained.
- If coolant temperature is lower than switch value, a very low resistance denoting a closed circuit should be obtained. If switch does not respond as outlined, replace thermo time switch.
- If switch passes resistance test, allow coolant temperature to cool below stamped value on switch. With ohmmeter connected, connect battery power via an isolating switch to terminal "G".
- Using a stop watch, check delay time as ohmmeter changes between high and low resistance. Delay period should be as specified. See Coolant/Delay Time Relationship chart. If not, replace thermo time switch.
COOLANT/DELAY TIME RELATIONSHIP
| Temperature: °F (°C) | Delay: Seconds |
|---|---|
| 32 (0) | 4.5 |
| 50 (10) | 3.5 |
| 95 (35) | 0 |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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