Connections between WB's and copper tubing are sealed with this product:
Settings of the XP2400 (1st week 2003 AIUHB).
Motherboard Monitor Dashboard Idle (Ambient temp=25.5°C and Panaflo M1A radiatorfan at 6.5V)
Idem 100% CPUload with Prime95 after half an hour.

Difference between radiatorfan at 6.5V or 12V is merely 1°C...
Watertemp is measured with 10K NTC in my airtrap (and connected to mobo) and fishtank termometer for calibration.
To be continued...
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