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Below is form the haynes manual not sure if it any help to ya.
The thermostat housing is on the right hand side of the engine if i can remember, i think i changed the wrong one when i done mine, i changed the one on top of the housing instead of the one on the side.
Coolant temperature gauge sender
Testing
1 If the coolant temperature gauge is inoperative, check the fuses first (see Chapter 12).
2 If the gauge indicates overheating at any time, consult the “Fault findingâ€￾ section at the end of this manual, to assist in tracing
possible cooling system faults.
3 If the gauge indicates overheating shortly after the engine is started from cold, disconnect the temperature gauge sender’s
wiring multi-plug. The sender is located below the thermostat housing on HCS engines, adjacent to the thermostat housing on CVH and PTE engines, and on the forward-facing side of the thermostat housing on Zetec engines. If the gauge reading now drops, renew the sender. If the reading remains high, the wire to the gauge may be shorted to earth, or the gauge is faulty.
4 If the gauge fails to indicate after the engine has been warmed up (approximately 10 minutes) and the fuses are known to be
sound, switch off the engine. Disconnect the sender’s wiring multi-plug, and use a jumper wire to ground the connector to a clean earth point (bare metal) on the engine. Switch on the ignition without starting the engine. If the gauge now indicates Hot, renew the sender.
5 If the gauge still does not work, the circuit may be open, or the gauge may be faulty. See Chapter 12 for additional information.
Removal
6 Refer to the relevant Part of Chapter 4 and remove the air cleaner or air inlet hoses, according to engine type as necessary, to
gain access to the sender unit.
7 Drain the cooling system (see Chapter 1).
8 On Zetec engines, disconnect the expansion tank coolant hose and the radiator top hose from the thermostat housing’s water
outlet.
9 Disconnect the wiring multi-plug from the sender unit.
10 Unscrew the sender and withdraw it.
Refitting
11 Clean as thoroughly as possible the sender unit location, then apply a light coat of sealant to the sender’s threads. Screw in the
sender, tighten it to the specified torque, and reconnect the wiring multi-plug.
12 Reconnect the hoses, and refit any components disconnected for access. Refill or top-up the cooling system (see “Weekly
Checksâ€￾ or Chapter 1) and run the engine. Check for leaks and proper gauge operation.
_________________ 
Sig. made by xmadxmoex
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