Technical Climate Control Fan Not Blowing

[PedroMC]

Hi, Newbie here.
We have a 1.2 Evo Punto with the digital climate control and now the fan blower has stopped working. I've initially thought it could be the blower resistor but I saw on another thread that the digital version has something different and I'm not sure what or where I'm meant to be looking to find the possibly faulty part. Another thread had mentioned this part, DENSO DRS99502 Blower motor resistor, but again, where is it and is this likely to be the problem.

Any help would be appreciated as its starting to get baltic up here in Scotland and my daughter uses the car for work.

 

[judderbar]

I believe the digitally driven fan power circuits are part of that panel. Meanwhile until you get a replacement panel or it get it fixed, you can reorganise the fan motors wiring so it is isolated from the panel and gets a direct feed to run at full power when the ignition is on. But a word of caution the fan is using 9 amps continuously when the bearings (self lubricating bushes) are in good condition. As the cars age you need to oil those bushes or the fan slows down and takes more current and burns something out. The manually operated fan uses a 30 amp fuse. You will need to add a 30 amp inline fuse to your wiring

 

[PedroMC]

UPDATE. The new regulator resistor thing arrived on Friday from Autodoc and I wired it in yesterday, but now the fan blows all the time, and full when turned off. Could the new part be faulty or have they sent the wrong one. Don't know where the pollen filter is either and I bought a new one to replace it in case that was causing it to pull too much power.

 

[TimFuller]

UPDATE. The new regulator resistor thing arrived on Friday from Autodoc and I wired it in yesterday, but now the fan blows all the time, and full when turned off. Could the new part be faulty or have they sent the wrong one. Don't know where the pollen filter is either and I bought a new one to replace it in case that was causing it to pull too much power.

Did you ever get this sorted? I have the same problem and I'm struggling to find where the resister actually is. All the info on the internet appears to be to do with manual controls rather than digital buttons. I bought a resister from ebay for about £10 but I'm beginning to think it's not the right part.

 

[judderbar]

Did you ever get this sorted? I have the same problem and I'm struggling to find where the resister actually is. All the info on the internet appears to be to do with manual controls rather than digital buttons. I bought a resister from ebay for about £10 but I'm beginning to think it's not the right part.

I think you need to repair or replace the digital panel. you can get these panels from ebay for 25 to 45 pounds

 

[TimFuller]

Thank you. I'll look into it. So am I right in thinking that the big green resister (that most of Google tells me is the solution) is only for manual control dials?

 

[judderbar]

Some of the punto evos have a manual heater control and some have the digital controls. You have the digital controls and cannot find the resistor so i am supposing there is no resistor and the electronic controls are managing the switching of the fan speed

Also I think these problems happen because the bearings on the motors get dirty and dry out and are not easily oiled at the fan end. The higher motor load then burns stuff out. So you need to take the motor out. at one end there may be a rubber plug which you can pull out to reach the bearing there. But at the fan end you have to use a long stick and try to get oil as close as you can to the bearing and let it run down the shaft to the bearing.

 

[TimFuller]

Some of the punto evos have a manual heater control and some have the digital controls. You have the digital controls and cannot find the resistor so i am supposing there is no resistor and the electronic controls are managing the switching of the fan speed

Also I think these problems happen because the bearings on the motors get dirty and dry out and are not easily oiled at the fan end. The higher motor load then burns stuff out. So you need to take the motor out. at one end there may be a rubber plug which you can pull out to reach the bearing there. But at the fan end you have to use a long stick and try to get oil as close as you can to the bearing and let it run down the shaft to the bearing.

You were exactly right. Burnt out connectors. Thanks so much for your help. I've greased the bearing at the bottom, but I cant get anywhere near the bearing at the top. I guess if it overloads again, I'll just have to buy a new motor.

 

[PuntoHowTo]

You were exactly right. Burnt out connectors. Thanks so much for your help. I've greased the bearing at the bottom, but I cant get anywhere near the bearing at the top. I guess if it overloads again, I'll just have to buy a new motor.

These climate set ups use a PWM module (pulse width modulation) in place of a resistor, they basically switch the fan on and off rapidly to control the a speed of the fan.

If the module fails then the fan stops working, more costly than a resistor pack on a normal system but generally more reliable, the biggest cause of failure is not replacing the pollen/cabin air filter which gets clogged and the fan draws a much higher current as it’s unable to move the air through the filter.

Make sure you replace the cabin air filter at the required intervals even if you drive around with the aircon switched off and windows open during the summer months

 

[TimFuller]

These climate set ups use a PWM module (pulse width modulation) in place of a resistor, they basically switch the fan on and off rapidly to control the a speed of the fan.

If the module fails then the fan stops working, more costly than a resistor pack on a normal system but generally more reliable, the biggest cause of failure is not replacing the pollen/cabin air filter which gets clogged and the fan draws a much higher current as it’s unable to move the air through the filter.

Make sure you replace the cabin air filter at the required intervals even if you drive around with the aircon switched off and windows open during the summer months

Good plan. I'll take a look at the filter. It's blowing, but it doesn't seem to be very strong.