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X Eng Fan Switch

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zulublue:
I am so glad I have found this thread, I have had a X thermostat fitted for about 10 months now, its on a D90 200 TDi, I fitted it to the output side of the rad for the reasons L90ook said, It is set on the lower temp side of the thermostat, but it has never clicked in either in the hottest day in summer of off roading, I have wired the switch directly to the fan to test and it works fine, but it seems that the engine never gets hot enough.
My temp gauge does sit right over on the white bit before the black and the red and never moves, the engine is a Disco block with my original defender casings etc all I used was the cast block itself, I have wondered if I have wired it wrong, but Simon at X-Eng says my diagram is fine. I can touch the output side of the rad with my hand so I guess it's doing it's job.

It's now at the point that I will direct wire it to a switch, and keep an eye out don't know what else I can do really.

dazzawhipple:
On my old V8 i fitted it to the top of the rad


Darren

PS Merry christmas .........

V8MoneyPit:
Their recommendation to put it in the bottom hose surprises me. As RRC says the hot water leaves the thermostat (when open) and into the top of the rad. The cooled water is then pumped back into the block from the bottom.

If the engine begins to get too hot, the thermostat remains open all the time, so I would expect to measure the temp at that point to determine when to switch the fan on.

But I guess fitting it in the bottom hose is fine as long as the switch/sensor is rated a lot lower because the water has already been cooled.

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