Thanks Paul.
To "hot wire" it I ran a jumper from the brown wire at the fuse box to the
black/green at the rad sensor and the fans worked.
I believe you are right on. I looked at the set up again, and I do have
both. The DPO has wired the aftermarked switch (adjustable with a copper
wire that runs into the rad. hose) directly into the two wired, I suppose
original, sensor that sticks into the radiator. I put the two wires that go
into the aftermarket switch together and the fans run, so I guess I need a
new switch.
Thanks,
Monte
----- Original Message -----
From: "Telewest (PH)" <paul.hunt1@blueyonder.co.uk>
To: "MonteMorris" <mmorris@nemr.net>; "MG list" <mgs@autox.team.net>
Sent: Thursday, August 29, 2002 3:59 AM
Subject: Re: fans not working
> IME there are two types - an electrical switch that fits in the rad and
has
> two wires coming from it, this type has a fixed operating point and is not
> adjustable and is what was supplied by the factory; or a bulb that is in
> contact with the coolant, possibly inserted in the top hose, and a
> capilliary tube to a remote adjustable switch where you can vary the
on/off
> setting and this is an aftermarket system that usually comes with its own
> fan(s). You seem to be describing both types.
>
> On the first type if linking the two wires at the rad switch causes the
fans
> to run (ignition on) the rad switch is bad. On the second type if linking
> the two wires at the remote switch causes the fans to run then the
combined
> sensor/remote variable switch unit is bad as these items are not
seperately
> replaceable.
>
> I suppose there could be a third type with a continuously varying
electrical
> rad sensor, like the sender for the temp gauge, that goes to an electrical
> circuit with a potentiometer to vary the on/off point but I have not seen
> one of these. On that type if linking the wires at the rad sensor causes
> the fans to run the sensor is the problem as before. If that doesnt work,
> but linking the wires at the remote adjustable switch does, then the
remote
> circuit is at fault, but the rad sensor could be faulty as well.
>
> What did you 'hot wire' to get them to run?
>
> ----- Original Message -----
> From: "MonteMorris" <mmorris@nemr.net>
> To: "MG list" <mgs@autox.team.net>
> Sent: Thursday, August 29, 2002 5:00 AM
> Subject: fans not working
>
>
> > Our 79B is overheating and running into the "red zone". The fans are not
> > coming on, even though I hot wired them and they do work.
> > How can I test to see if the problem is with the sensor or the
aftermarket
> > adjustable fan switch (yes, I did try adjusting it both ways to its
> limits).
> > The two wires of the fan switch is wired into the two wires of the
sensor
> > plugged into the radiator.
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