we have a Grunert AC450 supplying both the fridge and freezer
. Dual thermostats, dual solenoids. When just one side is calling for freon, it works very well. But if both sides call, neither side will cool, and sometimes continue with temp rise. There is a 1/4 inch pressure line connected to a tee that connects to two 1/4 inch lines going to the solenoids. Both solenoids and coils have been replaced along with both expansion valves in the boxes. Refrigerant is full. Has anyone had a similar problem, and if so how did you resolve??