The sending unit is located in the engine block or cylinder head.
TESTING
- Locate the sending unit and unplug sending unit electrical harness.
Connect instrument gauge system tester 014-R1063 or its equivalent to the sending unit connector.
- Set the tester to 275 ohms, turn the ignition key to the RUN position, wait 60 seconds and read the temperature gauge in the instrument cluster. It should read C .
- If the gauge does not read as specified there may be a problem with either the cluster gauge wiring or the cluster printed circuit board.
- Set the tester to 18.3 ohms, wait 60 seconds and read the temperature gauge in the instrument cluster. If the gauge is now in the H position and was in the C position at 275 ohms. The sender is defective and should be replaced.
REMOVAL & INSTALLATION
See Figures 1, 2 and 3
Fig. Fig. 1: The temperature gauge sending unit is located on the bypass tube next to the ECT sensor just above the bellhousing-3.0L OHV (2 valve) engine
Fig. Fig. 2: Remove the temperature gauge sending unit using a suitable tool
Fig. Fig. 3: Before installing the temperature gauge sending, coat the threads with a suitable thread sealant
CAUTION
Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
- Disconnect the negative battery cable.
- Disconnect the sending unit electrical harness.
- Drain the engine coolant below the level of the switch.
- Remove the sending unit from the engine using the proper size socket.
- Coat the new sending unit with Teflon tape or electrically conductive sealer.
- Install the sending unit and tighten until it is snug.
- Attach the sending unit's electrical connector.
- Fill the engine with coolant.
- Start the engine, allow it to reach operating temperature ,bleed the cooling system and check for leaks.
- Check for proper sending unit operation.
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