I bridged the yellow plug sensor on the thermo and it made a click noise everytime i bridged the brown wire with the red/brown wire as said in the post below. Fans/pump after-run fault-checking You can use the following procedure to find out if your yellow temp sender is the cause of no after-run or not. This does not necessarily prove that the yellow temp sender is working, but it will prove if the circuitry that it controls is working or not. Turn ignition key on, then off again Disconnect the 4-pin connector from the yellow temperature sender switch Bridge contacts B, D (brown/red and brown