That would be a good test, unfortunatly I don't have your tool, if not I'll give it a go. What I was thinkink is that the intercooler can cool so much air flow in a certain time with the cool air flowing from outside, most of the time I am in city centre, the turbo still kick in, but the intercoolet doesn't cool much as the outside air not flowing fast on it.
Also its like an electric element, if the power of the latest is not enough to heat up a X amount of liquid, its useless, This is why I was wondering with the high air flow and speed flow from the turbo, is the intercooler doing anything in fact?
Cheers.
Olivier.
Oh, do I make any sense?

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E300TD year 2000. RUSTY SOLD
cost a fortune to maintain on the road
but run well on WVO
Second Merc died due to corrosion ( NOT rust) How can mercedes get away with that for so long?
Third lasted a month then went away...
Fourth now... Corroded too...