Hello all.
My set up is Zetec engine and Mega squirt.
I have Greengauges dials.
My question is I intend to fit an electric fan to the radiator and would like to feed this from one of the senders in the water system I have two senders in the thermostate housing. ( see picture)
Am I correct that the top sender is for the radiator fan control and the bottom one is for the temperture reading on the Gauge .
Or would I be better off buying an after market thermo switch?

Doe's the Mega squirt need to connect to a water temp sender?


[Edited on 15/2/06 by piddy]
Rescued attachment 1.jpg

Second picture.
Rescued attachment 2.jpg

On my pinto the fan sensor on rad is near to the top of the rad (Micra) and the engine sensor that sends signal to DD2 is on the block just below head.

Fan kicks in when gauge reads 95deg.

The sensor at top of your pic looks very similar to my fan switch.

Does this help?

The top one is the one the ECM looks at I believe.The other I think is the temp gauge one.

You need to trigger the fan from a rad switch or inline stat in the pipe from the thermostat housing. Your radiator will only circulate water when the thermostat opens so the fan only needs to run under these conditions.
If you trigger the fan from the engine temeprature, then it will be running when it is not necessary.

[Edited on 15/2/06 by nitram38]

Thank chaps.
If I use the top one for the rad fan and the bottom one for the gauge readings.
What does the ECU use to read? Can it share one of the other senders?

I'm pretty sure you can't share a temp sender. Usually you get an approved sender with the electronic dashes (like my Evodash) which means trying to find the inevitable adaptor. btw your block thread is 3/8"npt .

I've got FOUR temp senders - one each for the ecu, Evodash & EWP Water pump controller - I've also got one on the Golf rad which suprisingly I am not using

standard top sensor is no good for fan switch you need to replace this with a new sensor for the fan. on zetecs operates fan at 92 deg you can get these from ETB as a direct replacment.

Neither is a fan switch. One is for the dash, and the other for the ECU.

Senders can't be normally be shared.

Best bet would be to either

• Fit a rad which will accept a fan switch (polo?)
  
• Fit an in-line converter into the top rad hose
  
• Use one of the outputs from the MS to switch a fan relay
  

Here you go....

Linky

But you need to be running MSnS-E code...

BTW you may find it useful to put some jubillee clips on those hoses!!!