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Sometimes a heated air inlet to the air box does more than an emissions thing. My daughter's late, unlamented, Honda was carbureted. This car had a thermostatic valve which mixed air from the cold air intake with heated air off the exhaust manifold, much like the Volvo. When that thermostatic valve failed in the open position, only cold air got in. If you drove that car on a cold, foggy night, ice would form in the venturi of the carburetor stalling the car. She would leave the car by the side of the road and call me for a ride. Sure enough, when I arrived, the car would not start. The next morning, I'd go to get the car and it would start just fine, the ice had melted, you see.
I had the car towed to an older mechanic who said he thought he knew what the proble was. Sure enough, it was that thermostatic valve. He told me when he first ran into that problem, it took quite a bit of head scratching to figure out what was going on.
I haven't heard of Volvos icing up at the throttle body and, with fuel injection, it probably wouldn't stall the engine anyway even if there was ice. Just thought the forum might find this interesting.
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