Electric Cooling Fans: Description: Notes
NOTE:
If detonation is a problem, it is possible that the cooling fan is not coming on at proper temperature and engine is overheating.
The cooling fan is a 2-speed motor. Low speed of cooling fan should come on at 198-207°F (92-97°C) and will shut off at 183-196°F (84-91°C). High speed comes on at 210-221°F (99-105°C) and will shut off at 196-208°F (91-98°C).