Quote:
Originally Posted by Poodwaddle
If the radiator hose that contains the thermostat is cold then it means the thermostat isn't opening. If it is hot and the return is cold then it means that there is no flow through the radiator. The fact that it started when you replaced the pump suggests an air bubble. Try starting the car (from cold) with the radiator cap off and let it run for 20 minutes or so until the thermostat kicks on. Bubbles will start to come up. You can rock the car back and forth to encourage bubbles to break free.
If this car has a sealed reservoir then check the reservoir lines (connected to the radiator cap) for any sign of cracks or leaks. Even a tiny hole will cause the coolant to steam out. This will reduce the pressure inside the radiator. Reduced pressure means lower boiling point, causing gradual temp rises.
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Poodwaddle, thank you very much for your sharing your knowledge, it has been very helpful.