Technical Heather/AC fan

[ptrk]

Hi guys,

help needed with heather/ac blower under the glovebox.

Few weeks ago found burt contact on the controlling electronics (near the fan). Changed it for new one and still don't work. Fan works, fuse is new.

Don't know what's next. Maybe relay? Can't find which one.. Anyone help?

Thank You

 

[Greasytrucker]

Bit confused, what’s actually not working as you’ve put that it’s still not working but then you’ve put fan works? Burnt connections means somethings obviously not happy. If the blower isn’t working it could have seized which could explain burnt connections, although the fuse should have blown in theory before it got to that stage

 

[ptrk]

Bit confused, what’s actually not working as you’ve put that it’s still not working but then you’ve put fan works? Burnt connections means somethings obviously not happy. If the blower isn’t working it could have seized which could explain burnt connections, although the fuse should have blown in theory before it got to that stage

Fan works (tried to connect it on 12V and it's fine), speed regulator is new so as fuse..

 

[ptrk]

Separetly works everything perfectly fine, but together when I turn on heather/ac fan wont start.

 

[Greasytrucker]

You mean the cooling fan at the front isn’t working?

 

[ptrk]

Fan inside the car, under the glovebox is not working. Works separetly, but all together it wont blow the air..

 

[Greasytrucker]

Ah get it now, so when you turn the knob for the blower nothing happens, but you’ve checked the blower and it works when you connect it directly to 12v. I take it you’ve tested the switch to rule it out?

 

[ptrk]

Yes I did..

 

[Greasytrucker]

what was the burnt connection on? What do you mean when you say controlling electronics?

 

[ptrk]

what was the burnt connection on? What do you mean when you say controlling electronics?

Burnt conncector on speed regulator near fan

 

[Greasytrucker]

@bugsymike @koalar any ideas on this one???

 

[bugsymike]

@bugsymike @koalar any ideas on this one???

Does sound like a new fan control switch and maybe the wiring plug also required.
It may be worth checking that the fan is working freely and not overloading the circuit causing extra heat in the wiring plug/switch area.
In the past the heater fan speed resisters fitted to the side of the fan housing used to fail on Fiats, now they have moved the weakness further along.
If no obvious cause then all OP can do is replace damaged parts and check correct fuse for fan is fitted.

 

[koalar]

1: Manual A/C

2: Or climate controlled A/C

 

[ptrk]

Does sound like a new fan control switch and maybe the wiring plug also required.
It may be worth checking that the fan is working freely and not overloading the circuit causing extra heat in the wiring plug/switch area.
In the past the heater fan speed resisters fitted to the side of the fan housing used to fail on Fiats, now they have moved the weakness further along.
If no obvious cause then all OP can do is replace damaged parts and check correct fuse for fan is fitted.

Fan freely works, everything is new even the connector has been replaced

 

[ptrk]

1: Manual A/C

View attachment 474927

2: Or climate controlled A/C

View attachment 474928

Second option is mine

 

[koalar]

Second option is mine

Right that's a variable fan controlled by a digital pulse width modulation signal

I have no wiring diagram for you car, will it be close to the grande 199

Fiat usually use a relay and fuse at the front end

And control the fan via the body computer, climate control system, and the fan speed variator

If it was my car, I would start by using bidirectional (wow) software and read the codes and perform an actuator test to switch it on

Not sure if multiecuscan or alfaobd is capable of integrating the climate control unit