I got the block heater changed out today on the 1984 190 D 2.2. I got the coolant refilled, burped, started the engine and continued to top the coolant up until it remained level. The temp gauge began to climb and I put the cabin heat on high and it wasn't puttin out any warm or hot air. The engine temp gauge continued to climb until it just started to hit the red line at which point I shut it down to come ask for suggestions about what I may have missed or what may be amiss. It's acting as though the coolant system thermostat isn't opening up to begin circulating. Is there anything else that could be going on? Suggestions and help are much appreciated...thanks guys.

Jim