What's the main cause of the low coolent system not working?

[Bob Dunahugh]

It's a piece of aluminum that contacts the coolent. A light bulb. Wire. Then that little circuit board. Anyone knowledgeable on that board. Bob Dunahugh

 

[RF_Burns]

Bob,
Somewhere I believe I've seen the schematic for the coolant circuit board. I looked this morning, but haven't found it.

If the light bulb is working and there is power and ground to the board, that only only leaves fixing or replacing the board.

--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that

 

[RF_Burns]

Bob,
I found the schematic of a three-wire coolant circuit board. I think there is also a 4 wire version. If yours is a 3 wire, it may be simple to fix if
faulty.

http://www.gmcmhphotos.com/photos/low-coolant-module/p58512-low-coolant-module-schematic.html

--
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that