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Old 11-10-2006   #16
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Re: Heater Blower

The button to which i refer is on the bottom row of the heater controls second from the right i think it is the button you press to quickly defrost and demist the screens and blow warm air at the windscreen ,Many thanks will check out the aircon posts
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Old 13-10-2006   #17
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Re: Heater Blower

Well after thinking i had cracked the interior heater fan problem it has stopped all together now .
I have disconnected the connector that pushes into the blower beneath the drivers side it has a large red wire and a large black wire and two smaller ones one being white and the other green .
I used a test meter and found 12v across the red and black wires , If i leave the test meter connected to the large black wire and then put the positive side of the meter to the white wire i can control the voltage by the controls on the climate control panel ie the fan speed buttons is it fair to assume the motor itself is dead or is the green wire an additional trigger ?????????

Many thanks Steve
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Old 13-10-2006   #18
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Re: Heater Blower

Here are the wiring colour scheme (Italian first letter Negro= Black, Blanc= white Verta=green etc)

N= BLACK
B= WHITE
C= ORANGE
M= BROWN
A= LIGHT BLUE
S= PINK
V= GREEN
R= RED
Z= PURPLE
G= YELLOW
H= GREY
L= BLUE

The fan is fed constant 12v power with ignition on through Fuse F8 through relay T8 and the fan controls alter the resitance on the output of the fan to earth, so to check the fan, check you have power on the light blue wire to the fan and then earth the brown wire output. Fan should go

If it does then you forget the fan and check through the resistor pack for problems. Resistor packs do cause problems so check for continuity and different resistances there
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Last edited by Deckchair5; 13-10-2006 at 14:33.
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Old 13-10-2006   #19
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Re: Heater Blower

THe wiring i speak of is the plug which actually plugs into the motor itself is there an additional earth to the plug that goes to the motor ????
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Old 13-10-2006   #20
Whaddya mean too old?
 
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Re: Heater Blower

No, think of it the other way around, main power goes straight to the fan through fuse F8 and relay T8 and the fan earths through the resistor pack with varying resistance controlled by the fan speed control switch hence differing fan speeds

Look at this circuit diag which shows light blue as fan 12v main power in and brown wire output to resistor pack which then goes to earth through the pack and control switch
Click image for larger version

Name:	air con circuit 2.JPG
Views:	221
Size:	118.3 KB
ID:	19610

It looks like -at the resistor pack
grey = fan speed No1
grey/black = fan max ie pos 4
Speeds 2 and 3 aren't shown wire colours

J4 is the air con relay which will put the fan on at speed No 1 regardless of whether fan control is off or at speed 1
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Last edited by Deckchair5; 13-10-2006 at 14:43.
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Old 17-10-2006   #21
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Re: Heater Blower

Where abouts in the vehicle will i find the resistor pack of which you speak , Feel really stupid but i bought a air con tester yesterday that you clip onto the system and i found the system was over pressured well in the red ??? Would the heating system play up if the air con was buggered ????


Thanks Guys
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Old 17-10-2006   #22
Whaddya mean too old?
 
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Re: Heater Blower

An overpressurised aircon system will prevent the aircon system from starting when you select it. The internal fan comes on at posn 1 speed (if you have the fan speed switch off) when you select air con so, when you select aircon operation. you might momentarily get internal fan go on and then switch off again when it senses a wrong system pressure. Bring the aircon system pressure down by releasing some gas from the aircon inflation valve.

Look through these videos for recharging air con system
http://www.id-usa.com/how_to_videos.asp

Wear gloves and eye protectors. Keep your hands/ face out of the way of the gas/liquid if you are depressurising


There is an electrical pressure valve at the front of the car called a linear pressure valve because it senses a too high or a too low pressure. It prevents aircon start up unless the pressure is between the two limits otherwise damage to the compressor can happen. Your air con will probably start once you get the system pressure correct

The heater fan speed resistor pack is next the heater fan
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Last edited by Deckchair5; 17-10-2006 at 08:49.
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Old 17-10-2006   #23
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Re: Heater Blower

Have just been to an air con spiecialist and told me i need to get the internal fan working first prior to recharging the air con itself ?

I have disconnected the connector which clips directly to the heater motor which consists of a thick black wire a thick red wire and put a test meter over the two wires and get 12v

I then put the test meter over the thick red wire and the next one along pink i think and can control the voltage showing on the test meter with the buttons on the climate control panel (fan speed i assume)

I have put the meter across the the green wire and the thick red wire and get 12v ?

I cannot get the air con snowflake to switch on and off and assume that this is down to the pressure in the system although occasionaly it will flash four to five time on start up and thats it have bought a gauge will take your advise on that link you posted
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Old 17-10-2006   #24
Whaddya mean too old?
 
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Re: Heater Blower

"Have just been to an air con spiecialist and told me i need to get the internal fan working first prior to recharging the air con itself ?"
Yes. Get the basics going first

To test your circuits you need to
Test your voltages between the object and ground (earth).
Test the resistance between the earth wires and earth to be near or at zero

Testing between one wire and another won't tell you a lot but can get you into trouble if you don't know what you're testing

So look at the wiring diagram i sent you on the presvious page and work through it systematically

Check the fuse F8 see if you have power either side
check the relay, see if it clicks with ignition on
check for voltage in and out there
now check the fan voltage in and out

Now check the earth of the fan. Check the resistance between the fan out put and a good earth.

If the fan has power in and the fan output has connection to earth then the fan should obviously go

If it doesn't then the fan could be stuck (leaves etc) or the motor brushes and contacts are up the creak

Can't help you with wire colours. they are often different to the wiring diagrams unfortunately
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Old 19-10-2006   #25
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Re: Heater Blower

Well had a call back from the fiat dealer yesterday afternoon ,Turns out the heater motor itself is shot ,quoted me 240 including motor,fitting,and vat ,Not bad i thought ,I am having the aircon recharged and a new pressure switch fitted all in with the fan stuff 420 NOT BAD I THOUGHT I thought the dash had to come out i presume they just take the steering column out for access ??????????????
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Old 20-10-2006   #26
Whaddya mean too old?
 
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Re: Heater Blower

That's good then, I think they train rabbits to get down into the recesses of the footwells to change the heater fan and they cost plenty. Can't expect any mere mortal technician on subsistence pay to be able to grub about down there

Should be back on the road in no time then
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Old 02-11-2006   #27
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Re: Heater Blower

To remove the heater motor you remove drivers side center consol kick panel and then tyrap the clutch pedal right back to the steel tube that is part of the brake system linkage you then undo and take out the bolt which goes through the lower universal joint on the steering column you can then slide the column up and off the splined shaft as it is telescopic and swing out of the way you then remove the three screws with a 5.5 mm socket and then carefully remove motor i have done this myself as an experiment that worked

Hope this helps someone else out


Although i still need replacement motor any ideas my fiat garage havnt a clue
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Old 03-11-2006   #28
Whaddya mean too old?
 
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Re: Heater Blower

Thought about an auto electrician repairing it? Could be cheaper and quicker than waiting for a new one. I can't imagine it's worn out at that age, more likely to be lack of use. If it's wiring or brushes then it wouldn't take long at all to fix once taken apart
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Old 12-01-2007   #29
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Climate Control [faulty fan?]

my newly acquired pre-owned stilo jtd has a heater/aircon problem-it seems to have a mind of its own, switching the fan off and on at random,also the snowflake symbol, whether on a heat setting or on screen clear. Took it to fiat dealer for 84k service today, said (ominously) they would let me now price of complete replacement heater control unit. Any suggestions please
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Old 15-01-2007   #30
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re: Climate Control [faulty fan?]

If its climate control then thats what they do, maintain a set temp, switching fan speed temp etc to keep the car at a pre-set temp.... if its just standard aircon then its fritzed!

Lil Snowflake comes on if temp drops to 3' degree's outside, and stays on until it rises above 5' degree's hence why it comes on and goes off at random intervals!
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