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Yes, see if they run. They will run MORE often with the AC on, they will run at varying speeds depending on the signal from the fan control module. That module is also a trouble spot, so if you don't see the fans ever run, I'd say it's more likely to be the rather pricey module rather than the fan motor, but obviously you'd want to have the aux fan system tested, or at least try jumping battery power to the fan motor (which is fairly easy to do) to see if the motor is capable of running, which if it is kinda points to the module as the fault, but not with 100% accuracy, but pretty darn convincing anyways.
This assumes thet the problem is more likely to occur while plying the shady streets and byways of sunny Racine (BTW is it RAY-seen or RUH-seen? and do I get a free kringle for answering this?)
If this is happening out on the highway, at that point I'd say something else is going on, because with a car with a radiator up front, the fans are "along for the ride" by the time you get up to 30 mph or so.
Another possiblity is there may be an accumulation of dirt, leaves, trash, etc between either the fans and AC condensor or condensor and radiator, which is partially blocking the airflow through the outside fins of the radiator, this would affect cooling in town as well as highway use.
Finally when was the last time that a coolant replacement was done? It's due every 3 years, and I recommend using the MB coolant, not the green stuff.
Doubtful that it's the headgasket, just to put you at ease about that. Unless you check the coolant at spot oil slime in it Usually ona 104 motor you first would notice oil leakage at the block and head seperation point usually at the right front or right rear.
Gilly
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