C 15 at work is running hot to the point of alarm. Thermostats were removed and the problem continues. I have recently pulled the diverter solenoid on the WJPC and found the rubber snubber on the end of the plunger had ripped off. After pulling the rubber piece out and using shop air to clean the hole, water began coming up through the hole so I reinstalled the solenoid to not lose all the water. Can the engine be run like this? Is this diverter supposed to open and close and allow water to pass through the cooler? Also I noticed the hose that goes to the fitting behind the oil cooler was soft while the other hoses had pressure. It has water only in it since the oil cooler was replaced and the coolant had oil in it.