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Discussion Starter · #1 ·
Hello all...first time poster, long time reader...

I have a 2004 2.0 NBC that I'm trying to recommission and it fights me at every turn...

So far I've had to completely replace the bonnet locking mechanism (inc. cable and pull, which was fun), the bonnet, boot struts, resolve roof operation issues, clean the interior, clean the front crash sensor contacts, and - most recently - replace the cambelt/water pump.

Latest issue is that as soon as I reconnect the battery the cooling fans run at high speed. Both fans - as soon as the battery is connected. The only way to stop them is to disconnect the battery.

I have:
Checked the external/ambient temperature sensor
Checked the AC switch is off
Checked the green thermo switch in the hose on the right hand side of the engine
Checked the big fuses in the battery-mounted fusebox
Unplugged the cable for the radiator mounted thermo switch

All with no difference. Unplugging sensors doesn't change anything, but I think I expected that it would fail 'safe'...?

So...I look to you for advice. Where do I go from here? I can't get the radiator-mounted (bottom right) thermo switch out, but will this control the on/off of the fans? Would that cause it? I've ordered a replacement green switch but putting a meter across the 4-pins shows the same results (for continuity) as the existing one (ie: continuity across two pins but none of the others).

Is the next step the bottom sensor/switch, or is it the FCM? Or is it likely to be the green switch anyway...? Or something completely different...?

Many thanks for any guidance! I'm a little perplexed by electrics 馃槅

5/23/10 <3
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