Mk.1 Tdi Front Fresh Air Blower Doesn't Work

[Vilius]

Sadly that trainee's can't get access to posted images, so I could sort mine problem out maybe by myself.

I've got left-handed Mk.1 Galaxy with climatronic and a week before it flashed 10 secs on startup, and blower didn't operate at all. VAG-COM showed faulty fresh air blower, so I disassembled right passenger lower panel, and took out this blower with electric motor. Tried to feed it with 12 Volts, and it started spinning that I barely hold it in my hands. So it's working, and assembled again to the place. No flash, everything fine. By the way, before I checked voltage on blower 2-pin connector, it showed from something 7 volts (lowest panel setting) to battery 12.6 Volts (full 5 speed setting). But yesterday it began flashing again, thought about corroded motor 2-pin connection and disassembled it again, but voltage this time was constant, nevertheless it was off or full speed air flow setting. And on startup key position it was 6.8 Volts, and 7.8 Volts when engine was working. Looked through russian workshop manual of alhambra/galaxy/sharan (btw I'm from Lithuania), and there on wiring diagrams couldn't find version for electronic climate control. In ETKA I found that there is a 4-pin resistor pack, and a relay "114" (VAG 701 959 141 A), both of them connected to blower. Mine question would be, is that relay the same on Ford? Because on forums I found mentioned R19 relay, but I can't figure out where it is. Or anything else can be faulty?

[gregers]

it might require a regas.do a search it has been covered many times b4.hth.

[Vilius]

Blower motor itself doesn't work. Mechanically it doesn't spin, because not correct voltage is supplied from climate control panel via relay (which one I don't know) and resistor pack near blower motor. A flashing panel shows that there is fault stored in ECU, not that a system needs a re-gas (but sometimes this could be that fault).

[mk2vr6]

try replaceing the resistor pack? if the fan only operates on maximum speed and nothing else it's a sure sign the pack has blown!

[Vilius]

Will check resistance on this pack pins. But if I turn climatronic to full blast (all 5 bars illuminated), voltage on blower motor connector does not increase, it stays constant. So problem shouldn't be resistor pack.

[mk2vr6]

you wont get any more than 12v's+ the pack drops the supply to the motor hence the lower speeds, when the switch is set to max the resistor back is bypassed, that why the fan is not working on the lower settings! if the pack has blown there is no continuity and power to the fan motor

[Vilius]

It seems, that a blower control unit is dead. VAG number 1J0 907 521, red gadget with a huge heatsink. Ground connector on it is burned through, and plastic around it is melted.

[mk2vr6]

that will be the resistor pack then :rolleyes:

[Vilius]

It's resistor pack for manually controlled blower, but models with electronic climate control have this one instead of it. And as resistor pack on wiring diagram is before blower, this control unit is connected afterwards and controls earth connection on fan motor. :rolleyes:

[Vilius]

Changed this burnt control unit with another one from donor car. But another problem showed up - I can only get this blower to blow, only at max revs (5 bars from 5 on A/C panel), other settings just don't work. Checked resistance on this ground from blower cable, and found, that it's very high (my multimeter doesn't show it) on all settings, except max blast, when it shows 0 Ohms. To check if this control unit isn't faulty, checked voltage between this small control cable that comes from A/C panel and ground - so at max revs it shows 9.85 Volts, on other settings just zeros. Problem is in A/C panel itself. Is there any cheap method to fix it? Or look for another one taken from scrap car?