Have been trawling through the forum to try and find info on an Air Con/coolant blower problem without success. Here's the story:
I have a 1999 2.0 HDI diesel (GLX model - D8 I think). The Air Con didn't work when I bought it but finally got round to having the condenser replaced and system re-gassed. Once this was done a problem showed up. Neither of the fans (twin fan model) come on when the AC is turned on, either on auto or aircon setting. After a few seconds the STOP light stars to flash. I guess the ECU thinks it has no cooling. If the setting is switched to eco (no aircon) then all seems well. If pin 2 on the centre relay is earthed then both fans run at slow speed. If the blue connector, which I believe is the engine coolant sensor is unplugged the the left hand fan (if you are standing in front of the car facing it) runs at full speed when the ignition is turned on. Everything seemed to point to the engine coolant control module (bitron?) not supplying the earth. Went looking for the bitron in the nearside front wing as per every post I've read. Nothing there. Not even a place/plug where it could have been. Went to the local dealer and asked for a price on one (just to see what it looked like). He said according to the VIN number which I gave him my model doesn't have one, nor does it have an air conditioning control unit. More than that he couldn't/wouldn't say.
Come to think of it, as the HDI seems to run so cool, don't even know if the fans ever worked as they are supposed to, regardless of the AC problem. I have rotated the three relays so each is now in a different spot. No change.
Sorry for the long post but I'm tearing my hair out over this (what little hair I have)
Has anyone else had any problems in this area? Any chance of a schematic/circuit diagram (even hand drawn), anything to help point me in the right direction. Haynes says it has an engine coolant control module, so it is obviously no use for this problem.
All suggestions appreciated
There are those with access to wiring diagrams (I'm not one of them I'm afraid) so hopefully they'll be able to give you a bit more detail on that score. I've been pouring over the parts diagrams and I can't figure out what controls the fans for cooling the air con, my old D8 has a "temperature box", which I suppose is what this bitron is actually called. However on the diagrams for yours it's missing... In the absence of anything more useful to tell you, I reckon you should check out the wiring - it seems to me the wires end somewhere around the battery tray, which is the usual place for weird underbonnet electrical faults
