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East Longmeadow, MA
This happens mostly at the start of the day. Cold or moisture may make it worse- not sure. Happens 3 out of 10 starts early, then OK rest of the day. Changed the battery, the Starter, Swapped the A/C relay and the starter relay in the fuse panel, to check for bad relay - no change. Playing with Shift seems to have no effect.
Other wise there is no problem. The car can be driven ontill you use the heat or air conditioning. I have looked for bubbles in the coolant when warmed up, indicating a head gasket leak. This is a 160,000 mile "new" car with less problems that the "old" car. No radiator leaks, hose leaks, cap holds pressure. Antifreeze appears to boil out of reservoir but I am not certain that this is where it goes. Enough antifreeze is lost to cause the heat to stop working. Thanks