LS400 Water Temperature Switch

Using a DVOM, check for continuity between water temperature switch terminals. For water temperature switch location, see Figure. See WATER TEMPERATURE SWITCH CONTINUITY  table. If water temperature switch continuity is not as shown, replace switch.

Fig 1: Cooling Fan Relay No. 3 (LS400)

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Fig 2: Engine Main Relay (ES250 & LS400)

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Fig 3: Cooling Fan Relay No. 1 (ES250 & LS400)

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Fig 4: Cooling Fan Relay No. 2 (LS400)

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Fig 5: Cooling Fan Relay No. 2 (ES250)

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Fig 6: A/C Clutch Relay (ES250)

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Fig 7: A/C Pressure Switch (LS400)

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Fig 8: EFI Main Relay (ES250 & LS400)

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Fig 9: Cooling Fan Relay No. 3 (ES250)

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Fig 10: A/C Clutch Relay (LS400)

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