[qcj]

About a year ago Newell changed my coolant and the next morning when I pulled out to hook up the car my low coolant light came on.  I checked the sight glass in the tank above the radiator and it showed full.  The reservoir was a little low so filled it about half way and when I looked again the lights had gone off.  Came home with no problem.  About six months ago I turned the ignition on without c anking the engine in order to raise the coach to do some work under it and the lights came on again.  I check the sight glass and was full.  I then opened the tank slightly and coolant ran out.  Went back inside and lights were out.   This past week we took a trip to Kerrville, about 300 miles from Nacogdoches,  and all went great until it was time to leave.  The same thing happen.  The lights come on when you turn on the ignition for about 3 seconds then out, only this time as twice before they came back on.  Check engine, low coolant, cut off engine.  I back out and pulled around to hook up the car.  After about a minute they went off. Drove home with on problem.  This is the third time this has happen in the past year.
What i plan to do is what Richard suggested and that is to start with the coolant level sensor on the tank above the radiator.  I pulled a couple of my tail lights and can get to it pretty well, but can't tell whether it is a npt 1/4" or 3/8 without taking it out.  It would be nice to have one on hand when I do take it out.  I have already cleaned the terminals in the rear side engine compartment where there are 24 terminals and #15 on mine is coolant.  They were pretty nasty so I cleaned all 48 of them.  If anyone else has any suggestion I would like to hear them.  I know that Russ said the check the connection at the engine computer and that is on my list.

I have owned the coach for 5 years and never had this problem until the coolant was changed. Sort of strange.