Dodgy fan switch?? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

kingy · 10-26-2003, 21:09

Hey all, i've got me a problem. When I start the car and turn the air con on, the fan will only seem to work on boost. However after a few minutes the other settings will work fine. It doesn't happen all the time though - other times I start the car I have full control over the fan. I hope it's only the fan switch rather than the fan itself. Any ideas and help appreciated.

kingy · 10-27-2003, 21:17

Well, can anybody help?

oze50 · 11-01-2003, 23:28

u mite like to check the fan speed resistor under the dash near the fan ( cermac block 3 wires going to it)

TopGhia · 11-02-2003, 00:55

Is it climate control? That fan speed is set automatically depending on interior temperatures and such like. It will slow down when correct temp is reached. If it is not climate control - then I haven't got a clue.

cheers

bilwils · 11-05-2003, 02:43

If it is climate control it will probably be the fan speed controller that is a metal box behind the glove box in the heater case with a large transistor in it. It sits where the fan speed resistor usually is on low series models.

kingy · 11-06-2003, 19:53

Quote:

Originally Posted by oze50

u mite like to check the fan speed resistor under the dash near the fan ( cermac block 3 wires going to it)

I had the chance to take a look today - nothing wrong that I could see (wires look ok, can't see anything loose), but I don't have much electical knowldge so what exactly am I looking for wrong with the resistor?

If it helps, I was driving along today with the fan at 3, when it just cut out - switching it on to boost and back again fixed it. And no, i don't have climate control.

Cheers,
Riaz

bilwils · 11-07-2003, 16:11

It will be the resistor for sure then. If it was the switch it wouldn't work at all. When it's on boost it doesn't run threw the resistor it just sends 12volts straight to the fan.

kingy · 11-08-2003, 00:43

Sounds good- hopefully an easy fix. Once I get another resistor, what would be the easiest way of replacing it? Just a matter of old one out, new one in? Any tips? The gregory's manual doesn't get into detail about the resistor. Any help appreciated

XWish Ute · 11-08-2003, 05:36

Sorry to play devil's advocate here, but if the switch contacts are a bit dodgy, it may cause intermittent operation of the fan as well. Only way to tell is either substitute a known good switch (cost factor!), or pull the suspect one out, and test it. could use a voltage source and a test lamp, cycle switch through all its settings a number of times and make sure the lamp will light when the appropriate speed is selected! Of course, you also need to know which pin does which on the switch.....