Running bench test; Outside temp - 90 deg, RPM - 2800, Large fan blowing on Bike, ran for 40 min then shut down. Cooled HES cover with 40 deg water til cover was cool to touch (10 min) bike will not start. Run power to PUR/YEL wire for fan, run fan for 10 min then bike re-started. Bike ran for 15 min then shut down. Run fan only (no cooling HES cover w/water) for 10 min, bike re-started. Suspect ICU overheating. Thoughts?