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What are these 2 plugs?

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Old 08-08-04, 11:44 PM
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What are these 2 plugs?
I know this is a dumb question.

See pic...this is the back of the thermostat housing...1 is black and 1 is yellow.

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Old 08-08-04, 11:45 PM
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The yellow one is probably supposed to be green. It's the coolant temp sensor for the ECU. I don't know what the other thing is.
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Old 08-08-04, 11:47 PM
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If I recall correctly...

The greenish one is the water level sensor. (Oops, Jeff20B is right, that's the ECU temp sensor).
The black one is the thermoswitch (turns the radiator fans on at about 230°F).
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Old 08-08-04, 11:47 PM
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yellow/green = engine thermo sensor - lets ecu know how warm the engine is.
black = thermo switch to control fans.

they are both clearly documented in the FSM, which is available online.

-bill
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Old 08-08-04, 11:48 PM
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no, the level sensor is on the front side of ther thermostat housing.

-bill
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Old 08-09-04, 12:18 AM
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I just can't even imagine how difficult it was to remove that...
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Old 08-09-04, 12:00 PM
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... not really too bad.
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