GLS Class (X166) Produced from 2016 to 2019

Coolant tank cracked... 57k miles gls450

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Old 07-15-2023, 09:46 PM
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X166 gls450 2017
Coolant tank cracked... 57k miles gls450

Anyone experienced the coolant tank just split from front ? No check engine light yet. Have to leave for a 1000 mile trip tomorrow but now I'm skeptical...




Old 07-16-2023, 12:04 PM
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2017 GLS 550
Can't say I'm surprised, they really should be replaced every 5 years or so. They're pretty cheap. Our '17 GLS 550 has 44k miles and I'm probably going to get one on order, I don't want to be stranded in this Phoenix heat.
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Old 07-16-2023, 02:54 PM
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2012 C63;1971 280SE 3.5(Sold);2023 EQS 450 SUV 4 Matic (Wife's)
Needs to be replaced before you drive very far or something expensive is about to happen.
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Old 07-16-2023, 08:09 PM
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Originally Posted by 007_e350
Anyone experienced the coolant tank just split from front ? No check engine light yet. Have to leave for a 1000 mile trip tomorrow but now I'm skeptical...



This is a turbocharger cooler, not radiator cooler thought both use identical pink coolant. This tank is a two-piece design and this is 100% normal. Go on a road trip worry free. Surprised that folks with 4.6L TTV8 and 3L TTV6 do not know it by now (based on posts from users with 550 and facelift 450).
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Old 07-21-2023, 10:46 AM
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X166 gls450 2017
Originally Posted by threeMBs
This is a turbocharger cooler, not radiator cooler thought both use identical pink coolant. This tank is a two-piece design and this is 100% normal. Go on a road trip worry free. Surprised that folks with 4.6L TTV8 and 3L TTV6 do not know it by now (based on posts from users with 550 and facelift 450).
you were spot on!
the tank is inside holder that cracked from one tab location,

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