check the multi plug that connects onto the fans as water gets driven in there and might need a clean up. (one of my pins had corroded off so wasnt getting power to the fan.
have you unplugged the brown sensor on the thermostat housing? if you unplug it the fans should go to high speed you should hopefully be able to rule out the fans themselves
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1997 blaze GTI-6 bought january '11 £800
Spend to date on parts £827.88