Medium and Heavy Trucks
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Thanks for asking your question. I will try and help you out.
Since you have changed the thermostats and seals, I would next suspect you are getting too much flow through the top engine vent line on the engine. I have seen this before. The line is small and runs to the top of the radiator. But is have seen the fitting in the head become faulty or eroded and flow too much coolant and over cool the engine in the winter time. To confirm you can crimp the line and see if the temp comes up. If it does you'll know there's too much flow.
Please reply back if you need more help or have more questions. I am happy to assist.
Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.