Another Q for all you Zetec-knowledgeable LCB-ers;

Here are 2 Z thermo housings :-

Zetec_Thermo_Housing

Each housing has 1 sensor, shown on the LHS of these housings. However, there is a difference between these housings.
That on the left has an additional sensor, shown angled on the RHS. The right-hand housing has no such sensor, and the hole has been blanked off, apparently by the factory, so presumably a standard production arrangement.

Assuming that the 2 sensors, on the LHS of each housing, are water temp sensors, what is the function of that angled sensor on the left-hand housing?

(I suspect that the right-hand housing comes from fuel-injected engine).

[Edited on 11/8/15 by Dick Axtell]

Some vehicles have/had one senor for the ECU and one for the gauge on the dash

Depends on the car model, the one on top, to the left in your picture is the ecu sensor. It has a much smaller range than a normal gauge type.

The one sticking out at an angle is for a gauge on the dash, and as such is a 1/8 npt thread so can be changed to whatever gauge setup you have.

Looks like your ecu sensors screw in, later models had a sensor that pushed in against an O ring and was held in with a wire clip.

The housings with the screw in sensor are generally better than the later types.

The large thread sensor at the top is for the ECU.

The smaller thread sensor at an angle near the bottom is for the temperature gauge.

Later cars did not need the sensor for the gauge since the signal is sent from the ECU.

The very last crate Blacktops had a sensor directly into the head between inlet ports 1 and 2 which meant the housing had no sensors and no threads, totally useless in a seven.

quote:

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Originally posted by Dick Axtell

(I suspect that the right-hand housing comes from fuel-injected engine).

[Edited on 11/8/15 by Dick Axtell]

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quote:

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Originally posted by Paul Turner
Every Zetec sold in the UK (and probably elsewhere) was injected, no carb engines in Escorts, Mondeo's etc etc.

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Just for info - They did also do an early alloy metal thermostat housing for the zetec. Very rare. Don't crack like the plastic ones can.

quote:

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Originally posted by SteveRST
Just for info - They did also do an early alloy metal thermostat housing for the zetec. Very rare. Don't crack like the plastic ones can.

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