Radiator Connections

[psychonaut]

Hi - I need some help with the radiator connections please. My van is a 1981 diesel, originally a 1600 but now fitted with a 1900 lump.

There are two connections on the right hand side of may rad behind the lower grill - one is the fan sensor and the fan runs nice and loud when I short out the connections. Did early T25s only have the one fan speed rather than two?

Below this is another sensor - I guess this is for the temperature gauge, but woule be grateful if someone could confirm this for me.

Many thanks in advance.

[Aidan]

Greg you have two switches, top one is lower speed 95'-84', sorry don't have a degrees symbol and the lower one the high speed 102 97 degrees if you bridge either you should get fan a respective speeds, but I don't know the wiring exactly they may be in series
later they went to one switch with two outputs (1983 MY on)

[psychonaut]

Thanks Aidan. When I bridged the connections on what I assumed was the temp gauge sensor, there was no fan but it did spark slightly, which is what made me think it was the temp gauge sensor.

On the sensor above it, which does set the fan running when the connections are bridged, there are definately only two connections in the connector.

Do I have a mutant T25?!

[Aidan]

sounds like maybe your full speed isn't working then, I'd want to check the wiring diagram before doing anything more to test it though don't want to stuff it completely

[psychonaut]

Thnks Aidan. I've got the wiring diagram here ready to take to work with me in the morning - I'll see if I can make head or tail of it AM i being dull to think that if it works on slow speed it should work on high speed too?

[psychonaut]

Update - took the wiring diagram to work and had a boo. You were quite correct, they are both sensors and work the low and high speed settings on the fan respectively. I cleaned up the connectors when i got home and doused everything in electro-clean. I also replaced a lot of the wire as it was badly perished. Shorted out each set of connectors in turn and I have a lovely sounding fan at low and high speed now

Popped some vas on the connectors to keep the moisture out, and put it all back together. Thanks for your help Aidan