R33 Heater/aircon Issue..pita!

[FTO]

Hey guys, got this annoying issue with the heater/aircon fan not working.

Everything else seems fine.

Checked the fuses, blower fan relay (3rd down rhs fuse block) all good.

I replaced the fan (without checking thinking it was that)..nope.

I installed another climate control unit..nope!.

I'm at a loss without a r33 circuit diagram or even wiring diagram.

I'm thinking maybe there's a control unit somewhere feeding the fan voltage, as the r34 appears to be different & has 3 wires going to the blower fan, not 2 as in the r33.

Any suggestions?...

[t_revz]

2 power supplies at relay? supply and signal? earth at relay ok too? havent got schematic either but sounds like you have replaced the big bits

[FTO]

Yes, the relay pulls in ok, and bridging the load contacts doesn't do anything.

What gets me is the r34 has a signal wire from the control unit to the fan, plus the 2 supply cables, so this signal wire drives a voltage amp inside the blower housing to control the fan speed.

The r33 isn't like that, it only has 2 power cables, and the control unit doesn't control the voltage because the cables are all light duty. Sooo there has to be some external device to control fan speed.

No idea where it is..

[t_revz]

had my entire dash out recently. cant say i saw anything prob cos i wasnt looking for a particular thing. definetely wasnt easily noticable. thought it would have been in the control unit. inspected around the ecm hey?? wonder if it would be near recirc area for the air to keep it cool. would be good to know what it looks like. ask google