Originally Posted by Mrmerlin

the hood light has an internal switch,
its a mercury switch , like the Thermostat switch in your house
and will turn off once the hood is closed

Originally Posted by FredR

A while ago the bonnet [hood] switch went south so I removed the fragments and put the replacement job on my cool season hit list. As most will be aware the switch engages the light under the bonnet when opened and it also prevents fan run on for safety reasons. My non stock twin fan setup is fully shielded so no real reason for the safety feature. However, although I am not worried whether the bonnet light functions or not, I noticed that my fans do not run on when the motor is shut down. Since I got the cooling system well sorted years ago the run on feature hardly ever comes on when everything is working as it should. Now, in my current situation with the switch broken and removed, am I correct in thinking that the run on feature should still work if the control logic determines it is needed? I am assuming it is just not needed but...?

Originally Posted by Broccoli

The light turns on/off with the mercury switch. The physical switch seems to do nothing. My car has no alarm.