Mercury D4.2L D-Tronic

INSTRUMENTATION
SERVICE MANUAL NUMBER 22
90-860074--1 FEBRUARY 2002 Page 4D-21
Water Temperature Switch / Sender
When the engine is COLD the audio warning circuit is normally open.
REMOVAL
1. Drain the closed cooling system.
2. Remove harness wiring from temperature switch / sender located behind the electrical
box bracket and accessible through a hole in the bracket, as shown.
3. Counter-hold the adaptor with a separate wrench.
4. Remove the sender and sealing washer.
75298
a
b
c
Typical
a-Harness Wiring
b-Water Temperature Switch / Sender
c-Sealing Washer