11 replies to this topic

[Dan16v]

Does anyone know how the Auxiliary fan is controlled on a 93 Rio, My aux fan is on permanently.

Haynes said that injection models are controlled via a thermostat in the bottom of the rad, but the carb model has a switch in the thermostat housing, all I can see in the thermostat housing is three vacuum tubes coming from a sensor of some kind. Any ideas??

I also have a minispares super 2 core rad which does have the thermostat in the bottom, but was added at a later date and hasn’t got any wiring going to it.

Cheers

Dan

[fikus01]

you can get a special 2 core with the switch in the bottom upon request but if u didnt ask for it it mite not be there!! as far as i know at the bottom front of the radiator there will be the 2 wires that turn the fan on if there was a switch thre, if its not and the fan is stuck on chances are the wires are jsut joined together!!

if u havent got the 2 core with the switch why not extend the wires to a switch in the car and turn it on when u wnt to!

[Dan16v]

you can get a special 2 core with the switch in the bottom upon request but if u didnt ask for it it mite not be there!! as far as i know at the bottom front of the radiator there will be the 2 wires that turn the fan on if there was a switch thre, if its not and the fan is stuck on chances are the wires are jsut joined together!!

if u havent got the 2 core with the switch why not extend the wires to a switch in the car and turn it on when u wnt to!

Cheers for the reply,

My 2 core does have the thermostat/switch in teh bottom but no wiring going to it, I take it I can just break into the main fan power cable and run either end to the two conections on the thermostat?

[fikus01]

yeh u can but have a look for the wires first, they do go into the corner

[Dan16v]

Any idea what colour wires go to the stat at the bottom of the radiator, I can see a lightgreen /white and black that are joined together coming down from the top of the grill from the loom.

Cheers

Dan

[Dan16v]

Or alternatively, has anyone got a picture of a radiator with bottom thermostat on MPI that I can see the wiring?

Thanks

[Sprocket]

You need to find the original wiring for the thermostat, they are most likely connected to ground or at least conected together at some point. They may even just be lying there touching ground. Do not break into any original wiring, and certainly do not break into the live and fit the switch there!!!!. Its the ground thats switched to prevent a short and possibly a fire if the switch were to fail. Remember electrics and water dont mix and the thermostat is imersed in water, thats whay the ground is switched. The switch grounds the relay which then carries the load of the fan.

All the wiring is there you just need to root around and find it.

Switch wires are Green with Black tracer and Black on its own.

Fan power wires are Black with Green tracer and Black on its own.

Light green and white? The light green and white is acording to the drawing a live from the fusebox so shorting it to a black (most likely ground) will blow fuses or cause a fire. And i thought this was a 93 carb, not a 97 on MPi???? Sounds to me that you are going to have to find out how to fix this yourself as from what you have said, it appears this is anything but standard. The wiring has been chopped about and a wiring diagram is now useless.

Oh and the fan switch wiring should follow the right side inner wing

Edited by Mini Sprocket, 27 January 2007 - 04:46 PM.

[Dan16v]

You need to find the original wiring for the thermostat, they are most likely connected to ground or at least conected together at some point. They may even just be lying there touching ground. Do not break into any original wiring, and certainly do not break into the live and fit the switch there!!!!. Its the ground thats switched to prevent a short and possibly a fire if the switch were to fail. Remember electrics and water dont mix and the thermostat is imersed in water, thats whay the ground is switched. The switch grounds the relay which then carries the load of the fan.

All the wiring is there you just need to root around and find it.

Switch wires are Green with Black tracer and Black on its own.

Fan power wires are Black with Green tracer and Black on its own.

Light green and white? The light green and white is acording to the drawing a live from the fusebox so shorting it to a black (most likely ground) will blow fuses or cause a fire. And i thought this was a 93 carb, not a 97 on MPi???? Sounds to me that you are going to have to find out how to fix this yourself as from what you have said, it appears this is anything but standard. The wiring has been chopped about and a wiring diagram is now useless.

Oh and the fan switch wiring should follow the right side inner wing

So from what your saying, the Green with Black tracer and Black on its own are conected to the two stat conections?

Theres no wiring down the inside radiator-side wing, Haynes seems to say that my 93 carb model should have wiring to a sensor mounted in the normal thermostat housing, but it doesnt. So it must be to the switch mounted in the bottom of the radiator, the same as any injection model.

There are only two wires in the vacinity of that stat which is the Light green/white and black, which someone has joined together using a clip and some elec tape, they are a bit more substantial than some of the others around it. There is a Green with Black tracer and Black on its own, but the greens conected to a Green with Red tracer and the black looks like it has been joined and nowhere near long enough to reach the stat.

The fans been running perfectly fine, its just its on constantly, preveos owner said they had done this on perpose as somone had chopped the main plastic fan about and gets hot in summer without the electric one on.

I might try and disconect a few of the wires and see when the fan turns off.

[Dan16v]

Eventualy found the right diagram in Haynes! Green with white tracer and black go to the switch, should be an easy fix to put some conectors back on and wire it up.

Any idea at what temp/position on the temp gauge the elctric fan should kick in?

Cheers

Dan

[Sprocket]

Typical rover so many bloody drawings for one car its unreal

If the gauge is in the Red the fan is on or about to be

Edited by Mini Sprocket, 27 January 2007 - 08:39 PM.

[clarkandrew45]

Does anyone know how the Auxiliary Fan is controlled on a 93 Rio, My aux fan is on permanently.

Haynes said that injection models are controlled via a thermostat in the bottom of the rad, but the carb model has a switch in the thermostat housing, all I can see in the thermostat housing is three vacuum tubes coming from a sensor of some kind. Any ideas??

I also have a minispares super 2 core rad which does have the thermostat in the bottom, but was added at a later date and hasn’t got any wiring going to it.

Cheers

Dan

I know this thread is bit old. But i need all the help you can give. I am having problem with my Auxiliary. I just want to replace this but I don't have any idea on this one. I've searched the net and no one can gave me an instructions. Please do help me. thanks

Edited by Deathrow, 09 December 2010 - 02:10 PM.
Link removed.

[Dan16v]

Does anyone know how the Auxiliary fan is controlled on a 93 Rio, My aux fan is on permanently.

Haynes said that injection models are controlled via a thermostat in the bottom of the rad, but the carb model has a switch in the thermostat housing, all I can see in the thermostat housing is three vacuum tubes coming from a sensor of some kind. Any ideas??

I also have a minispares super 2 core rad which does have the thermostat in the bottom, but was added at a later date and hasn’t got any wiring going to it.

Cheers

Dan

I know this thread is bit old. But i need all the help you can give. I am having problem with my Auxiliary. I just want to replace this but I don't have any idea on this one. I've searched the net and no one can gave me an instructions. Please do help me. thanks

what isnt working?

the fan is controlled via a thermostat in the bottom of the radiator, so cuts in when hot, although it does get hotter than you think before it cuts in. on my car i have removed the thermostat and have it wired to a switch.