So long as it's disconnected, it won't make any difference on startup, the exhaust manifold has to be hot before it starts making a difference in the warm up speed, but I'd rather wait a little longer for cabin heat than have a bunch of sensors and amm get fried......again.
Last time the air box thermostat on my 940t got stuck, it took out the AMM, TPS, rpm sensor, coolant temp sensor and melted the clips off my air box, all this leading to an unplanned stop in Ozona TX waiting four days ( with all the associated lodging and food expenses for four ) to have the parts "overnight shipped " in.
Overall cost of that little pest sticking, a bit over $1000 + having to be cooped up with cranky kids and even crankier wife in the middle of absoloute nowhere with nothing to do. Real fast way to screw up a vacation.

Yup, I can wait a bit longer for warm up..no problem.
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-------Robert, '93 940t, '90 240 wagon, '84 240 diesel (she's sick) , '80 245 diesel, '86 740 GLE turbo diesel, '82 Mercedes 300SD for sale