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Ed:
A relay powering up that pump doesn't sound right. I will try to get a little time to research that circuit a little, because it does sound a little fishy. Either that, or here's something you could try. With the key off, disconnect the negative terminal of the battery for maybe a minute or 2, then reconnect it. Does the pump run? I think it runs for 5 minutes or so, then shuts off. if it runs for only that amount of time (roughly), then I'd say we're on the wrong track with the coolant pump.
You could try sitting in the car and pushing out on all the doors to make sure one of the doors doesn't have a touchy switch that is making an interior light come on, and also be sure to check the rear hatch for this, as we have had a few touchy microswitches in the trunk latch causing the rear light to come on. Make sure the rear light isn't in the manual mode, I would think you would notice that, though.
Also, I don't suppose there is a chance you are accidentally leaving the headlight switch in that left/right parking light position?
Other than that, the only thing to suggest is having them do a careful resting current draw test, and have them make sure the battery is good, a good battery test, including individual sg test of each cell, could be just the battery.
Maybe even do an overnight test of resting current draw with a good VOM with recording function like a Fluke 88 has, to check for intermittent current spikes.
Gilly
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