Heater fan resistor

[TurboTony]

I have second speed on my S3 but no slow speed fan. So, it looks like the resistor has had it. Can any of the gurus advise the following:

Spec of the resistor needed as a replacement and where to obtain

or, rather than delving into the depths of the heater assembly, can I use another resistor by cutting the full speed wire and splitting at a point behind the switch to use both switch wires - one direct and one via a new resistor.

Can I then use a 'modern' four speed set up and just use two outputs. These are available super cheap from breakers yards.

I looked at a 12v dimmer to use as a rheostat but I think that it needs to be substantial and expensive.

Any help welcome

Cheers Tony

[phillpot]

TurboTony said:

rather than delving into the depths of the heater assembly, can I use another resistor by cutting the full speed wire and splitting at a point behind the switch to use both switch wires - one direct and one via a new resistor.

Looking at the wiring diagram looks like the speeds are controlled from inside the motor, a tapping into the windings perhaps?
The blower motor on my Taimar ( like this but 4") is single speed with a resistor wire used as you describe to give low speed.

Adrian Venn (Exactly TVR) may have one? or would an instrument light resistor be worth trying (high enough wattage)?

or just live with full speed and open the window/take the top off if too hot

[Griffinr]

There is another way, by using a motor speed controller, this has the advantage of giving you variable speed. someone on here fitted one a while ago and I was going to follow suit but did not get around to it. I think it was something like this http://www.ebay.co.uk/itm/12V-30A-DC-Motor-Speed-C...

Rob.