Paging Mindwipe... Paging Mindwipe

Greetings ! Thanks for getting back.. I've been away a couple of days. Yes, it does have air con, and 2 fans. But the setup of the control seems different to many earlier 306s. It appears that it probably doesn't have a Bitron fan control unit at all (see thread between myself and Nigel starting 3/2/04) It's looking like the main ECU does than fan control on this late TU5 engine. I'm just praying it might be one of the sensors as opposed to the ECU. Luckily I have access to an identical friend's car tomorrow, so I'm going to measure the sensor resistance on his and compare it to mine. Any other ideas really most welcome...

Cheers,

- Steve

Hi Jeff, No, as far as I can tell it has not Bitron unit, but it does definitely have

3 relays and I can't find any resistors. I can only assume that the ECU controls the 2 relays directly ? There are 2 sensors near the thermostat housing, both with blue connectors. One of them has 3 wires and appears to have 2 thermistors in it. Nigel suggested that this was probably the sensor to the ECU. I compared it to a similar car today, and the resistances seemed similar-ish. Nigel suggested that the second sensor probably feeds the dashboard indicator, and I've not investigated that one yet. The car announced "STOP" again today in traffic - It was indicating around 95C at the time. I popped on the air con and it slowly cooled down again. I'm not sure what to try next. I shall probably check the earth bonding of the fan circuits, but I don't really suspect that. I'm tempted to try disconnecting the 3 wire sensor (with ignition ON) and see if that makes the fans come on ?

Many thanks for your help,

- Steve

connectors.

Hiya Jeff, I did take a very good look at that connector. I unplugged the loom and the pins looked bright and shiny. Nevertheless, I gave it a squirt of switch cleaner and re-mated it a few times for good measure. I'm guessing that it's probably OK because the fans do come on slow when the air con is ON? I was in traffic yesterday so I deliberately let the car warm up to check the (indicated) temperature when the STOP light came on. This was only 95C (indicated). Seems a bit low ? I also unplugged the (dual?) sensor with 3 wires and compared it's resistances with an identical car. The resistances at 10C and 70C seemed similar, so I'm presuming that sensor is probably OK. Today I tried to test the second sensor which has one wire. I had to take the inlet air "ducting" off to get access to it. Unfortunately the blue connector seemed "locked" in place and I wasn't sure how to free it connnector without breaking. I'd really like to be able to test it because once again I can compare it with a similar car. Any advice ?

Thanks again for your support Jeff.

- Steve