Well the title says it all, I have a Duramax in a SUV and for what ever reason GM has seen fit to wire the "low coolant" switch from the engine coolant resioir into the A/C control modual. Yep you read it right, the A/C head unit. If I swap the diesel dash for the gasser I still get the same alarm so I'm sure its comming from the engine, if I swap the a/c controler out then the alarm goes away but it wont support the rear a/c. Can't find the engine output for the alarm is there any way to get at it.
Eric