I checked the ECM. All it gives is a 12. The vacuum valve on the thermostat housing is new since my old one was old and a couple of the hose hookups broke off. The vacuum lines may be the problem. It isn't overheating and I just recently had to replace the heater hoses so I replaced the coolant. The coolant is full. There are no bubbles. The dealer up here in Alaska is a Volkswagen, Porsche, Audi and Isuzu dealer.
www.morrisonautogroup.com
I have replaced the PCV valve, Thermal Vacuum Valve, Heater Hoses, some vacuum tubing, coolant, battery, fuel and air filters. I don't know if this may be a problem, but it no longer has an air pump on it.