All D24T Volvos should be modified in this way. It's not good for the engine to have a "hot air intake". On all of mine, I remove the metal flex tube from the header to the airbox and remove the little plate on the header that it connects to (just so that it's not sitting there looking like something is supposed to attach to it). Then I open up the airbox and use a small screw to permanently fix the air diverter door in the bottom of the airbox assy in the "cold" position (I screw it shut on the hot side). On virtually any older Volvo, this system is almost guaranteed to be broken and it always fails in the hot position. This makes for worse performance, more wear and more heat in the engine, which is not what you need if you are trying to diagnose an overheating issue.
Everyone who hasn't checked this on their car should do it! A very easy and important modification...
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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