Normal Intake Air Temp (IAT) level on 2019 GLS 550?
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MBWorld Fanatic!
Joined: May 2010
Posts: 1,227
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From: Chicago
E63 SL55 996TT C5Z06
Normal Intake Air Temp (IAT) level on 2019 GLS 550?
I just purchased a CPO 2019 GLS550 with 39,000 miles on it and all stock.
I am noticing IATs with this M278/4.7L biturbo motor seem to be quite high when cruising they stay around 40F above ambient and nearly 60F above ambient in traffic is that normal?
This is my first Mercedes SUV as I’m coming from a 2004 SL 55 and a 2015 E 63S both of which usually keep IATs between +15 to max +25F above ambient.
I’m wondering if there’s an issue with the cooling system or maybe the intake sensors? Or is this a normal IAT range from what you guys are saying?
Other than that, I really like the car, super comfortable, decent power and unbelievable amount of space in it.
I am noticing IATs with this M278/4.7L biturbo motor seem to be quite high when cruising they stay around 40F above ambient and nearly 60F above ambient in traffic is that normal?
This is my first Mercedes SUV as I’m coming from a 2004 SL 55 and a 2015 E 63S both of which usually keep IATs between +15 to max +25F above ambient.
I’m wondering if there’s an issue with the cooling system or maybe the intake sensors? Or is this a normal IAT range from what you guys are saying?
Other than that, I really like the car, super comfortable, decent power and unbelievable amount of space in it.
Thread Starter
MBWorld Fanatic!
Joined: May 2010
Posts: 1,227
Likes: 185
From: Chicago
E63 SL55 996TT C5Z06
I just purchased a CPO 2019 GLS550 with 39,000 miles on it and all stock.
I am noticing IATs with this M278/4.7L biturbo motor seem to be quite high when cruising they stay around 40F above ambient and nearly 60F above ambient in traffic is that normal?
This is my first Mercedes SUV as I’m coming from a 2004 SL 55 and a 2015 E 63S both of which usually keep IATs between +15 to max +25F above ambient.
I’m wondering if there’s an issue with the cooling system or maybe the intake sensors? Or is this a normal IAT range from what you guys are saying?
Other than that, I really like the car, super comfortable, decent power and unbelievable amount of space in it.
I am noticing IATs with this M278/4.7L biturbo motor seem to be quite high when cruising they stay around 40F above ambient and nearly 60F above ambient in traffic is that normal?
This is my first Mercedes SUV as I’m coming from a 2004 SL 55 and a 2015 E 63S both of which usually keep IATs between +15 to max +25F above ambient.
I’m wondering if there’s an issue with the cooling system or maybe the intake sensors? Or is this a normal IAT range from what you guys are saying?
Other than that, I really like the car, super comfortable, decent power and unbelievable amount of space in it.
Oh well... I may go post this on the AMG boards where the crew is more active... GLS x166 here is zzzzzzzzzzzz.
Out Of Control!!
Joined: Jun 2004
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2014 E63S; AMS 100 octane ECU dyno tune; EDOK TCU tune; BB intakes; sprintbooster
I just purchased a CPO 2019 GLS550 with 39,000 miles on it and all stock.
I am noticing IATs with this M278/4.7L biturbo motor seem to be quite high when cruising they stay around 40F above ambient and nearly 60F above ambient in traffic is that normal?
This is my first Mercedes SUV as I’m coming from a 2004 SL 55 and a 2015 E 63S both of which usually keep IATs between +15 to max +25F above ambient.
I’m wondering if there’s an issue with the cooling system or maybe the intake sensors? Or is this a normal IAT range from what you guys are saying?
Other than that, I really like the car, super comfortable, decent power and unbelievable amount of space in it.
I am noticing IATs with this M278/4.7L biturbo motor seem to be quite high when cruising they stay around 40F above ambient and nearly 60F above ambient in traffic is that normal?
This is my first Mercedes SUV as I’m coming from a 2004 SL 55 and a 2015 E 63S both of which usually keep IATs between +15 to max +25F above ambient.
I’m wondering if there’s an issue with the cooling system or maybe the intake sensors? Or is this a normal IAT range from what you guys are saying?
Other than that, I really like the car, super comfortable, decent power and unbelievable amount of space in it.
several threads on IC pump and high IATs here:
https://mbworld.org/forums/w212-amg/...fixes-diy.html
Last edited by PeterUbers; Mar 20, 2025 at 11:21 PM.
