Adding Coolant to a Thor Palazzo / Cummins Diesel
Yes, I am new to the RV community but am anxious to learn and help. On a recent trip, I received a "Low Coolant" warning followed by a "Check Engine" warning. I pulled over and let the engine run for less than a minute and both cleared. I started back up the hill and after a couple miles, the same thing happened. Knowing I was near the crest, I persevered and the warnings ceased and I made it home without incident. I checked the coolant level after the engine cooled and it is below the MIN mark on the clear plastic reservoir.
My Question: Do I simply uncap the reservoir and put it in until it reaches the MAX mark or is there a special procedure which needs to be followed? Also, I purchased 1 gallon of Zerex Extended Life formula for Diesel Engines. It is not 50/50 but is it OK to cut this to 50/50 and use it in the Cummins engine?
I appreciate any assistance. There is a tag near the radiator which described opening and closing valves and running the engine but it does not say where the valves are nor where to add the coolant. Other searches have been worthless.