Too much pressure in coolant tank

[Jamesp]

The pressure is generated from the effect of temperature on the coolant, so my only thought is it is getting too hot or the coolant mix is responsible for the excess pressure. Have you cleaned your radiators and are you using the correct coolant mix?

[Jamesp]

Other thoughts are a stuck closed thermostat or degraded impeller on the water pump.

[bglz42]

Thanks James! Mixture is dead-on, radiators clean, no signs of high coolant temps, temps verified by Durametric. Have Airlifted, pressurized, and spent a fortune on tools and caps... still have the problem. Dealer says it is OK. Shrug...