Jwalker,
Thanks for the suggestions. The coolant level is just above the minimum. I smell the coolant as soon as I turn the heat on. It seems to me that if I leave the heat on for a while, the smell fades away. However, I don't know if it is really faded, or if my nose just gets used to it. I haven't put enough miles on the car yet (about 120) to know if the coolant is dropping.
I have had a look under the hood, but I could not claim that it was a through search. Because the smell comes with the heat, and leaves when the heat is off, I think the heater core is the prime suspect. I have considered short circuiting the heater hoses and rigging up a pressure tester for just the heater core.
Charley
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