Hi guys,

My internal fan / blower on my daughters 02 MK2 has stopped working. I've gone through everything I found on here about the fan and it still doesn't work. The baffling thing is, there is 12 volts at the fan plug. If I take the fan out and hook it straight up to the battery it spins just fine!

Here is what I have done:

1. Took the fan out and hooked it straight up to the battery, it works.
2. Got the multimeter out, I get 12 volts at the fan plug but it doesn't spin the fan! It also doesn't light a bulb (21w indicator bulb)!!!! This is on all 4 fan speeds.
3. I get 12 volts at each of the 4 terminals on the resistor pack in turn.
4. Went to a breakers and tried 3 different resistor packs - no joy.
5. Bridged the earth lead on the other connector as per a few threads on here - no joy.
6. The sidelights don't come on instead.
7. The reversing light works fine.
8. The relays appear to be fine, I've swapped them around and it doesn't make any difference.

Even though I'm getting 12 volts at the fan plug there doesn't appear to be enough current for it to work anything. Could it be all the resistor packs I tried are duff? Could it be the fan switch itself? Could it be the wiring?

TIA

Martin

What's the earth wire resistance like on the fan plug. I don't know where the earth point is.
The packs could all be duff - mostly they are fried - but all three, hardly.

Bit of an update. I unplugged the fan and wired a bulb into the connector. Turned the fan on and nothing, I put a multimeter across the bulb and got 5mV! Took the bulb out and it was 12V.
I took the resistor pack off and then wired the bulb across the positive from the fan plug and the negative coming from the switch and exactly the same. I'm guessing the fault is with the switch, or the wiring to the switch now?

There is 3 wires.

Check all 3.

There is a thick black wire.. alive
And a really thin wire..

one thing to bare in mind

When on max speed (4) The reistor pack is Bypassed - IE allows full 100% battery voltage into the fan

Also - the Fan recieves 12v Constantly - Its a got a negative switched circuit
So the resistor pack is after the fan

IF you apply an earth to the back of the fans connector with the bulb connected it should light up 100%



So have you checked the fuses?

There is 1 fuse that powers the Fan
F22 30amp
There is 1 fuse that powers the reverse light + Low current side of the Fans relay
F25 7.5amp

If they both check out fine
Swap the relay over from another one thats the same from either the internal or external fuse boxes for testing only

Does it work then?

Fan has been eliminated okay

The Resistor packs cant be rulled out - punto's are known for blowing them by overheating
They are also well known for the wiring / connections been melted too!


Ziggy

Ziggy122 said:

one thing to bare in mind

When on max speed (4) The reistor pack is Bypassed - IE allows full 100% battery voltage into the fan Fan doesn't work on any setting

Also - the Fan recieves 12v Constantly - Its a got a negative switched circuit
So the resistor pack is after the fan

IF you apply an earth to the back of the fans connector with the bulb connected it should light up 100% not tried that, will do that today



So have you checked the fuses? yes, checked both fuses, inside and under bonnet, both fine.

There is 1 fuse that powers the Fan
F22 30amp
There is 1 fuse that powers the reverse light + Low current side of the Fans relay
F25 7.5amp

If they both check out fine
Swap the relay over from another one thats the same from either the internal or external fuse boxes for testing only done that too, no diff

Does it work then?

Fan has been eliminated okay

The Resistor packs cant be rulled out - punto's are known for blowing them by overheating
They are also well known for the wiring / connections been melted too!

Ziggy

Click to expand...

The resistor pack wiring looks ok, it doesn't look to have overheated and all of the connectors look good with no signs of melting.

The two sides of three wire connector where I have bridged the earth cable looks to be bonded together, I cannot pull it apart. I have tested for continuity and all three connectors test ok and they don't have continuity between them.
The positive wire (blue one) looks to have overheated as it is very rigid where it plugs into the three wire connector.
Is the thin wire for the heater fan switch bulb?

Hopefully I'll get to the bottom of it today, thanks for the tips

If your on about This connector here

Then its a common failure item

If there is continuity TO either side - but NOT in the connection, with it been rigid and wont budge, then i would say that Yes - the earthing side has melted and gone open circuit

ziggy
https://www.fiatforum.com/punto-mk2...-sidelights-come-instead-my-interior-fan.html

Yes indeed, I was on about that connector. I had already bridged the earth wire. When I tested with a bulb connected to the battery + and the negative on the fan plug the bulb worked. When I tested it on the batter - and the fan + it didn't work.
I cut the blue wire on the side away from the fan, then connected it up to a bulb and it worked.
I have now cut that connector totally out and just bridged all 3 wires through. I'll go to a breakers and find a Punto with a connector that pulls apart and splice that in at some stage, for now though the fan works

Thanks for the tips Ziggy, much appreciated.

Yours seriously overheated then....

I went to a customers who had an earthing fault
Turns out the connector had melted
However since it was just the earthing once that failed, i simply cut one out of a punto and into his

Only on the earthing side tho - removed the other 2 wires in the connector that was spliced in to help with some air flow or heat disipation

Ziggy

Looking at the connector you wouldn't think it had overheated. No signs of meltage. Even though I have now cut it off I still can't separate the two halves!