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Normal IAT's for the M275

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Old Dec 27, 2025 | 08:53 AM
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2012 S65 AMG
Normal IAT's for the M275
I'm chasing high IAT's on my 2012 S65. Hooked up a scanner on a 75 degree day and IAT's were around 140F-160F cruising around at 50 MPH, and would go up to 180F when idling. Obviously way too hot, starting with a new intercooler pump and hopefully that will fix it. I have seen people say the cooling system is inadequate on these, but what is a typical spread from ambient air to IAT on these? The car still runs normally, no check engine light or anything so I'm not sure how long it has been in this condition.
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Old Dec 31, 2025 | 10:36 PM
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S-65 AMG
Are the radiator fans working?

Assuming they are I would make sure the intercooler does not have air in it and that the pump is working.
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Old Jan 13, 2026 | 11:16 PM
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222 S-65
OP you will find the charge cooling circuit to be a pain to get the air bled out. Fresh pump. Apply a vacuum to charge cooling to fill it.
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