Help! no more ventilation

[nonos]

I discovered yesterday evening that my ventilation does not work anymore. I am unsure when it failed, it could be related in a kind of weird way to monday's trackday although I can't understand how.
Anyway, the unit in the car seems fine (the display is ok, button work and all). The unit still control the flaps that close the vents and recycle (I can hear them when I push the buttons) but there is no airflow whatsoever.

I have checked 3 fuses that had a little fan symbol in the fusebox inside the car (there was I think a 10amp, a 15 amp and a larger 20 amp one).

I guess my next step is to get to the fan itself, but I would like to know if I have missed something, and also if anyone had the diagram of the connector to the fan so that I could check the correct voltage/regulation gets to it.

many thanks.

 

[BrianR]

Which car is it ??

 

[nonos]

MK2 172

 

[BrianR]

Have you checked ventilation fan is running ???

 

[nonos]

That is what I am trying to say, that is the part that doesn't seem to be running, but it looks likt a fair bit of work just to get to it, although I have not put my ear on it, but when it is running, it makes quite some noise generally (well, on full blast at least).

 

[BrianR]

Its dead easy to get to it, look at the guide I wrote on changing the pollen filter.
The fan is in the housing next to it !

http://www.cliosport.net/forum/showthread.php?t=223024

 

[nonos]

Its dead easy to get to it, look at the guide I wrote on changing the pollen filter.
The fan is in the housing next to it !

http://www.cliosport.net/forum/showthread.php?t=223024

Thanks for the link. I'll have to double check as according to the Haynes manual, the plastic covers the entire width of the car (and as a result you would need to remove the wipers also). I'll have a check at lunch time as you may have saved me a lot of grief here. Thanks again.

You don't happen to have the wiring diagram of the connector as well by any chance? (just trying my luck here)

 

[BrianR]

The Haynes is wrong, as it doesn't cover the Sport models. The panel on the drivers side comes off as I have described.

The wiring layout will depend on the build date.

Its almost certain that if the fans not turning, its the resistor pack that has stopped working.

I have successfully repaired a couple like the one I have shown below, but replacement is the only way if its the sealed can type. They cost £87 from Renault and a fan motor is £80.

If you need a fan motor, PM me I have a brand new OEM one.

Its well worth checking the fan isn't just jammed full of rubbish because the pollen filter is blocked.

 

[nonos]

Thanks for that. I checked and indeed it was a 20 second job.
Is there a way to check if the resistor pack is broken? I see from your pics it looks easy enough to remove. It looks to be a fair bit harder to remove the fan itself though as some bolts are quite far back.
Also I saw 2 sets of wiring (that are possibly not related to the fan). There is that block of wires that are visible on your pics (with the red clipping mechanism) but there is also a 2 wire connector which I guess connects to the resitor pack. Is this the only electrical connection to the fan? If so I could easily check I have some kind of voltage going to it.

Many thanks again, as the last thing I need it to get Renault involved. I'll let you know for the fan if I need it.

 

[airs 172]

hey mate just had to fix mine as mine fan motor wasnt working. mine is a dodgy connection in the motor its self. i jst had to fiffle around with it until it worked then cabletided it up when it worked.

 

[nonos]

hopefully it will be something simple too. I'll try to take the fan motor and resistor pack out tonight and have a look. thanks

 

[BrianR]

The two wire (brown/yellow) connection is for the stepper motor that activates the re-circulation flap. Check it by getting someone to press the recirc button while you look inside the plenum.

The red/black wires go to the motor.

If you'r resistor pack looks exactly like that one, you can test if the fan motor is working by pulling the plug off and shorting out the two black wires
The fan will run at full speed.

Look at the small silver pointed object on the top left of the resistor pack. That is a heat activated fusible link. Stick a meter across it and see if its blown (ie open circuit) if so you can do a temporary repair by soldering a 30 amp fuse in circuit till you can replace it.

 

[nonos]

Ok, I'll try all that hopefully tonight. The recirculation flap should work as I can hear it move and "clunk" when I press on the button inside. I'll see for the rest what I can try.
Thanks

 

[nonos]

Ok, my car doesn't look like the picture above. I have a connector (similar to the black/red one) but it is vertical. There are black and reds going to the fan, although by the time you hit the fan, you go from 3 red one black to 1 red 1 black.
The rest, here is the little connector which should be for the recycling, and a black, red, yellow and green go to a connector to the right of the polen filter. My guess is that this is the variable resistor thing which is located in a different place (have not taken apart yet).

Now, I have checked and there is 12V going to the fan, yet it is not turning (maybe not enough current due to the other part). No matter how much I put for the fan setting, the voltage stays at 12V.
So I am unsure whether it is the fan or the regulator still.

Any clue anyone?

 

[BrianR]

Sounds like you have a Mk2 Ph2.

The layout is slightly different if it has climate control rather than just air-con.

The resistor pack is a transistorised chopper circuit rather than resistive components type, If thats gone wrong, they are expensive.

If you say you can read volts at the fan and the motor is not turning, it doesn't matter if its low voltage, it should still turn. It sounds like the motor could be shot.

Take it apart and clean it by blowing it out with an airline and applying some electrical contact cleaner (Not WD40)

If that doesn't do it, you need a new motor. I have one if you get the part number off the old one, I can check its the right one.

 

[nonos]

I'll try to get the part number. From the photos, it looks similar, aprt from the fact that the place where the resistor pack is, it is one piece of plastic (the whole block in molded in one piece.

 

[nonos]

It looks like it is not the fan after all. Took it on a bench at work and it does turn all right. Sounds like it is more likely the resistor pack then. I have tried to remove the connector attached to it but it was not easy and I gave up. I'll have to try again now.