fitting an electric fan to replace viscous

[Madmark]

Has it been done by any one with a t2 2.7 if so how have you controlled how fan is turned on and where have you put the sensor

[elty001]

I fitted twin electric fans on my old terrano, had a sensor wired in to control box so you could adjust when the fans kicked in
My sensor went into the top radiator hose.

[jims-terrano]

Did you notice much difference with the electric fans?

[elty001]

Was a little better on fuel and in cold weather the engine got up to temp quicker.

[Madmark]

That's cool bud I like that. Where did you fit sensor to as I reckon in thermostat housing where other sensors are is best bet.

[rustic]

Originally Posted by Madmark

That's cool bud I like that. Where did you fit sensor to as I reckon in thermostat housing where other sensors are is best bet.

You are right, looking at the picture, he's fitted it into the top rad hose, you can see the wire coming out under the jubilee clip.

[solarman216]

Best place for sensing the cut in point of electric fans is in the bottom hose, as all the time the rad is doing its job properly this pipe will remain cool, when this pipe heats up to near top hose temperature this indicates the rad cannot cope and the fans to energise, sensor in the top hose has a much lower hysteresis, (cut in/cut out point) and so is much more difficult to set correctly, Rick

[Madmark]

Originally Posted by solarman216

Best place for sensing the cut in point of electric fans is in the bottom hose, as all the time the rad is doing its job properly this pipe will remain cool, when this pipe heats up to near top hose temperature this indicates the rad cannot cope and the fans to energise, sensor in the top hose has a much lower hysteresis, (cut in/cut out point) and so is much more difficult to set correctly, Rick

Perfect bud now is there a universal sensor or can I use any one as all must be set near the same. And I know you can get the alloy adapter that fits into hose

[elty001]

Top rad hose was the easiest option ,I also fitted a manual override switch so I could put the fans on when I wanted to.

[solarman216]

Mmmmmm, problem with manual over ride is that possibly by the time you notice that it needs over ridding it may well be too late, and in any case the top hose is regulated to whatever your thermostat is rated at (lets say 88 c) so by the time it gets to 94 and cuts your fans in the whole rad will be full of 88-94 water, not a good scenario, while in the bottom hose the fans will come on as soon as the rad temperature starts to climb not after it has already done so, so move your sensor to the bottom hose and set it at around 75 c, or lower, Rick

[elty001]

This was on my old truck which I sold a couple of years ago. I just fitted it as the instructions told me, unless I had the picture upside down

[Madmark]

Originally Posted by elty001

This was on my old truck which I sold a couple of years ago. I just fitted it as the instructions told me, unless I had the picture upside down

Lol

[Madmark]

Any idea what internal diameter is of bottom rad hose on 2.7 please so I can order the adapter

[rustic]

On our Austin Ambassador, the sensor was in a pocket halfway down the radiator. That had an electric fan.

[solarman216]

Originally Posted by Madmark

Any idea what internal diameter is of bottom rad hose on 2.7 please so I can order the adapter

Bottom rad spigot measures 35 mm and the lip at 38 mm, Rick