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Well, the airbox thermostat has been disconnected since I've owned the car. It has been fine with it disconnected before. So I don't think the problem is there.
The air box thermostat operates a flap. The flap is spring loaded to be open in cold temps and thus allow heated air via the preheat tube to be fed into the intake system, especially the AMM.
If the thermostat fails, the flap stays open all the time. If the thermostat is disconnected the flap could be open all the time. Feeding the AMM heated air all the time will eventually fry its innards.
Check in the air box to see if the flap is open. If you are in southern climes, pull the preheat tube off the exhaust manifold heat shield and let it suck in unheated air. Connect it for emissions testing, they may look for that in your area. They do here.
That whole system is designed to get the cat warmed up and working quicker than without the system. A dealer benefit of that system is that the invisible failure of a $35 part (thermostat) can lead to a dealer replacement of a $400 part (AMM).
Good Luck, and don't give up.
Bob
:>)
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