Hello guys,

Firstly I'd like to say I'm new to this forum so I really hope that this post in the right place etc! Also I have read so many 'Heater fan problem' posts on here and I understand its been done to death, but this is something a bit different I think!!

I have a 2004 1.9 HGT Multijet JTD Punto (Mark 2b) and basically the fan heater has stopped blowing. It has the full spec dual zone digital climate control until WITH air conditioning just in case that makes a difference. The control unit seems to be functioning absolutely fine; you can adjust the temperature, control the direction of the blower, put the air con on etc etc...but there is no actual blow, ie the heater fan does not fire up at ANY speed. It has 10 different speed settings because of the climate control unit and none of them work.

Today I have had the fan motor out of the passenger footwell and tested it. All seems to be working fine. My dad knows an auto electrician well and we have taken him the fan motor which he tested and said it was all in good working order. He said its most likely a problem with the resistor pack, which he then tested and concluded it was ok (as far as he could tell because he didnt really understand the resistor). We then took apart the dash board and checked all the connections on the back of the digital climate control system, and they all seem connected fine and in good working order.

So I phoned Fiat and they wouldn't give me any advice, they just said to book it in....but obviously without extending my overdraft by a considerable amount, letting Fiat do hours of exploratory work isnt really an option They did however quote me on a new fan motor which was £150 + vat (unbelievable!!).

So basically I need some advice. I also popped into a scrap yard this afternoon to see if I could get another fan motor and resistor just to try. I looked at a 53 plate 1.2 Petrol Punto mk2b and it was a different motor and resistor altogether from my HGT. Do I try to get my hands on another resistor to try or is Fiat going to be the only route? Basic internet searches show me nothing when it comes to the resistor pack I would need. Also just thought I would mention, the side lights do not come on when I try the fan so its not an earthing issue as stated in some posts. My dad has tested the power feeds to the motor with a multimeter and from the climate control unit to the motor and the voltages increase with every higher setting on the fan, so all seems to be good!

Any help at all would be appreciated as this is a problem that needs fixing, 2 days without a fan in a steamed up car are enough for anyone :/

Thanks a lot

Jack

I believe the climate control uses a PWM rather than a resistor pack (hence why your auto electrician friend didn't understand it)

It's a pretty complex piece of kit and only fitted to mk2b hgt and eleganza cars so to find one in a scrap yard you need to look by the hens teeth just next to the rocking horse poo.

I suspect this may be where your problem is the fan motor is just like any other motor add power makes spin.

You can test the Climate control system using diagnostic software like fiat ecu scan. My money is on a faulty PWM

Btw I have the same car and if you ever drive it for a day without there being a fault you're doing well

Try the motor in situ with a supplementary earth to the - side. My best guess is that it has simply failed because of crap contacts at the connector.

ePer may give some clues as to the particular resistor used in that car, but in my limited experience the resistor packs don't usually fail to give no speeds at all.

A couple of cheaper sources for parts are Shop4Parts and Big Mick at eurocarcare in Derby (Google will find).

Hi Andy, thanks for your reply. This does sound right yeah as the resistor packs look totally different to the bit we were testing earlier! What is this PWM thing and do you think I would just be able to pick one of these up anywhere separate to the full fan motor pack which Fiat quoted me 180 quid for?

Obviously I dont know for sure but the actual climate control system seems absolutely fine to me, it performs all of its other functions with no problem at all!

And yeah tell me about it! I love it when it works, goes well and I get really good mpg but I get constant electrical faults, usually easily fixed but its just such a pain in the arse! Wanna get rid really but im a skint uni student so would need another one fast and cant really be bothered with the hassle!

Thanks again!

fingers99 said:

Try the motor in situ with a supplementary earth to the - side. My best guess is that it has simply failed because of crap contacts at the connector.

ePer may give some clues as to the particular resistor used in that car, but in my limited experience the resistor packs don't usually fail to give no speeds at all.

A couple of cheaper sources for parts are Shop4Parts and Big Mick at eurocarcare in Derby (Google will find).

Click to expand...

Ok thanks a lot for that, ill give it a go

http://en.wikipedia.org/wiki/Fan_control#Pulse-width_modulation

Controls fan speed by modulating the voltage.

Did you get anywhere with fixing this problem?

I've encountered the same issue recently - having taken out the fan and checked it over with multi-metre and cleaned up the contact dust, it still ain't working.

I've found one supplier in Germany selling a replacement PWM pack but yet to know if they ship to the UK...or if that's even the problem.

I could be wrong, but I get the impression from the shape that the PWM pack is a combined PWM and heater.

The multi-metre showed that the black, negative wire/connector does form a circuit when I test it against the body shell of the car (there's an exposed part near the passenger door, by the glove box) so I don't think it's an earthing issue.

I do get resistance going into the PWN and then out from the PWN to the motor - so clearly a current could flow, but no idea if the resistance is correct, i.e. if enough voltage is flowing from the PWN to the motor or not.

The PWN/Heater part is made by Denso, part number A.430.008.00, should anyone else find this useful in future.

If I end up taking it apart again I'll take some photos and upload them, once I work out how, as the setup is quite different from the manual climate control.

The denso climate control unit is on canBus you could just get it connected up to a registered version of MES and see what faults are recorded.

But nothing you've done so far will really tell you anything about the state of the system other than you have an earth to the PWM (it's an M not an N)

Hi,
not sure If I've got a similar issue..in need of a little guidance

background;
bought a 2002 Sporting 1242cc , fan appeared DEAD on all settings,

checked fuses . all appeared o.k.,
went to wiring;

around resistor pack appear "cooked",
2 pole plug into fan appeared o.k. - but SLACK.

so went to scrappy, and got a good length of wiring loom,AND a resistor pack

got back, lowered fan, and checked it spun freely - it did

swapped resistor packs,

with fan out (on footwell) and resistor pack dangling,
I reconnected electrically, and the fan ran properly on all speeds, BUT the connections to resistor pack could be made to make / break with flexing

O.K., :idea: so swap wiring an all's good.

did this but it's ALL DEAD :shrug:

today - after a break.. I thought i'd test the switch.. if I run a meter from Ciggy lighter to the 4 "bars" of resistor pack..,
I get 12V, on all 4 "speeds" on switch and ZERO on "off", = so looks correct

Thought so - because if I push IN "for aircon" it lights up..




Conclusion: - of a fashion,
hanging the fan from the wiring puts some strain on it,
the delicate wires that run from the 2 pole FAN connector to a small BROWN box, appear "made" but I'm not sure what this box does..

is this the likely cause of ZERO supply voltage..,

ANY thoughts are MUCH appreciated, :worship:

charlie

after some inclement weather..,

I've been around again with a multimeter..,

turns out the "exchange" supply wiring to the fan motor is reversed - "polarity wise"

so the pole marked +, seems to be the negative in the vehicles circuit,

rigged-up a quick swap around.. no joy, then realised the power reaching the innards of the motor is only 10Volts..oh joy

looks like it'll have to wait for more crimps..,

checked wiring to "Brown box" appeared o.k.,


Charlie

I saw this and thought that I might be able to get some help with my Punto Eleganza 2004 , with climate control. We have the opposite situation, in that the fan runs at full speed regardless of the setting of the display. The fan motor has a different regulator to the standard 4 speed fan, and is a Denso A.431.001.00. Can't find anything on the Internet with this code. It would be great if someone could point me in the right direction. If the heating is scanned for faults, does anyone think that would help me? I am located in Derby if there is any one local with MES. Many thanks.

Peter M said:

I saw this and thought that I might be able to get some help with my Punto Eleganza 2004 , with climate control. We have the opposite situation, in that the fan runs at full speed regardless of the setting of the display. The fan motor has a different regulator to the standard 4 speed fan, and is a Denso A.431.001.00. Can't find anything on the Internet with this code. It would be great if someone could point me in the right direction. If the heating is scanned for faults, does anyone think that would help me? I am located in Derby if there is any one local with MES. Many thanks.

Click to expand...

Search for the fiat part number G17615A0 getting these is very difficult these days, these are 18 year old cars and climate control was rare to begin with

AndyRKett said:

Search for the fiat part number G17615A0 getting these is very difficult these days, these are 18 year old cars and climate control was rare to begin with

Click to expand...

Thanks for the reply. Unfortunately, neither the Denso part number on the side of the regulator or the number G17615AO come up with much in a search. It might have to be a new blower. If it had the standard 4 speed fan, less of a problem.

Andy knows far more than me about this

Modern era FIATs use a PWM I believe to do this job..
Cheaper alternatives have been mentioned on here before .. mainly with the GrandePunto

On a sidenote..

Worth consulting ePER to see what other numbers.. or fitments... are common to this item

ePER link :

Cannot recall if your 188 punto is
Bz benzina
Ds Diesel


Charlie

varesecrazy said:

ePER link :

Cannot recall if your 188 punto is
Bz benzina
Ds Diesel

FIAT PUNTO

eper.fiatforum.com

Charlie

Click to expand...

Thanks. It's 1.4 95bhp petrol.

Peter M said:

Thanks. It's 1.4 95bhp petrol.

Click to expand...

As a laugh, I rang Fiat for a price on a new blower.... £570. As full climate control, there are 3 fan options for the car, but only 1 correct to suit climate.

Try repairing the regulator you have. From the picture no. 3 above, in post #11, it seems that there are 2 condensators. Maybe they need replacement. Find an electronist and surely he could make it work again!

Mike1alike said:

Try repairing the regulator you have. From the picture no. 3 above, in post #11, it seems that there are 2 condensators. Maybe they need replacement. Find an electronist and surely he could make it work again!

Click to expand...

Success with the fan! ! After much trawling the internet, I found a very helpful UK company that supplied the Denso part needed. The regulator is a Denso DRS 99502 and is embedded within the fan housing. Simple to remove once fan is out. This is the link for anyone else who happens to have the full climate control and has lost fan control. https://www.sparkplugs.co.uk/denso-resistor-drs99502
Hopefully some one else will find it useful. By the way, the Denso fan reference is DEA 09044, which contains the resistor, but is 4x the cost.

Mike1alike said:

Try repairing the regulator you have. From the picture no. 3 above, in post #11, it seems that there are 2 condensators. Maybe they need replacement. Find an electronist and surely he could make it work again!

Click to expand...

These are not serviceable, if you look at the pictures you‘ll see that the components are sat in potting compound, you can’t remove them from the unit.

Peter M said:

Success with the fan! ! After much trawling the internet, I found a very helpful UK company that supplied the Denso part needed. The regulator is a Denso DRS 99502 and is embedded within the fan housing. Simple to remove once fan is out. This is the link for anyone else who happens to have the full climate control and has lost fan control. https://www.sparkplugs.co.uk/denso-resistor-drs99502
Hopefully some one else will find it useful. By the way, the Denso fan reference is DEA 09044, which contains the resistor, but is 4x the cost.

Click to expand...

Glad to see you got it sorted and even more thanks for coming back and posing the solution, many people are never seen again once they fix the problem and they never leave a note to say whether they have or not