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Sorry, I couldn't think of what it was when I first posted. It was the water outlet fitting for the heater feed that I replaced.
I've solved the overheating problem with the help from some members on another forum. The advise given to me:
Phil wrote: Here is a hint I have used on some cars. Disconnect the upper radiator hose from the radiator side and pour water or coolant in the end of the hose. On some cars the water doesn't get into the block until the water is hot and the thermostat opens so this method puts water on the other side of the thermostat so it gets into the block and head of the engine. I had to do it this way on my car.
Diesel Friend wrote: I second what Phil said. I would say that you have trapped air in the cooling system and therefore getting the high temperature. With the engine being cold I recommend you slacken off the hose clamps on the top rad hose. Remove the hose at the end pointing to the engine, twist it around a bit and fill the rad, then do the same with other end of the hose get coolant into the engine. Install the hose and tighten the clamps. Remove the cap from the coolant reservoir and start the engine and let it idle. Watch the temp gauge and also the resevoir.
At one point you will most likely see air burbing out. After this put the cap back one and take the car for a test drive. If everything is normal temp. should be about 80 Degr. F. All this with the thermostat in place. This procedure worked for me on 2.5 liter diesel non-turbo.
and Brian wrote: Exactly. The cylinder head cannot fill with coolant because the thermostat is closed. The coolant fills the radiator and the lower hose and comes to a dead stop at the thermostat. The only way to get coolant into the head is via the upper hose. You've got to remove the upper hose and fill the head with coolant which will eliminate the problem.
Hope this helps someone else down the road.
Chip
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