Been scratching my head recently about the interior fan... when I connected the battery up I was checking thru a few things and noticed that the Interior fan would only run at position #3 on the switch, when it was at positions #1 and #2 the fan wouldn’t move..
I had a quick search and the first thought was the fan could be a bit seized, so there was not enough power to run it at the lower speeds.. so out come the fan unit and following a little 3in1 oil, she was soon spinning as free as a wheel. Re-fitted and still no joy..
So I started to think that the Rheostat/Thermistor in the heater box was knackered... so figured I should look at it now before I got too further involved in re-fitting stuff.
Didn’t want to, but eventually pulled the dash out again, together with the heater box (don’t know why I was putting it off, now I know what’s involved it came out in a heartbeat!)

With the dash back on the table and a pikey power supply connected, I again found that the fan would not run on position no’s 1 and 2 of the switch.
I looked at the Rheostat/Thermistor and wondered if it was duff.. but considering the whole HVAC box is brand new, I thought it unlikely.
I have a new switch to fit to the car, so tried that and still it wasn’t working. These are the connections to the new Heater Box Rheostat/Thermistor. Notice how there are 4 connections but there is also a 5th where the terminal is clipped...?
I pulled the OLD heater box out of the spares garage again and noticed that again there were 4 connections, but this time there were only 4 terminals. I refitted the old heater box and tried the switch:

This time everything worked well and the fan was working at all 3 speeds.. I also then noticed that the fan was turning a different direction to how it was originally... and actually the way it was turning now, was indeed the right way..!
So I started to compare the different Rheostat/Thermistors and couldn’t really see much of a difference. I didn’t want to split the new Heater Box really to change the Rheostat/Thermistor so was considering to use the old original heater box.
One last thing to try though, was a little bit of a change of the wiring, as I could see there was definitely a difference between the two Rheostat/Thermistors...

I moved all of the connections one space to the left, and moved the black wire over to the right...
Well bugger me if that didn’t fix it all and now the new heater box and fan are working well on all 3 positions of the switch...!!
Thanks Renault for changing the design!!!!
Anyway, no harm, no foul, now that the Dash is back out, I have another cunning plan for the security of the car, and this will give me the opportunity to fit it.
Thanks for reading
