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I've got a 3.9 LUCERNE that was always losing coolant, Found that the spring type lower radiator hose clamp at the radiator was broken and allowing slow leak when not being run. The fan shroud blocked being able to see the source of the leak, along with how it was mounted in the car. Low coolant before refilling the res. will give air pockets in the motor/coolant lines, and probably why you only get heat while moving. Check all hose clamps, no matter how hard it is to get to them. I fought to get the 2 pieces of broken spring clamp off for a couple hours on my Lucerne and then used a screw type hose clamp. NO MORE LEAK and constant heat when wanted.
Good luck!
 
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