Mercedes-Benz Coolant Reservoir Breather Hose / Line 1665001091

OEM Part #: 166-500-10-91 (1665001091)

This page covers one exact OEM part number. Every unit we stocked has sold.

COOLANT RESERVOIR BREATHER HOSE / LINE This coolant reservoir breather hose, also known as the vent line, connects the expansion reservoir to the radiator, allowing for proper pressure regulation in the cooling system. Fitment includes 2012-2019 Mercedes-Benz models such as ML550, GLE63 AMG, GLS550, and GL63 AMG featuring 4.7L or 5.5L V8 engines. The part addresses issues related to coolant overflow and air pockets in the system. Interchangeable with OEM part numbers 1665001091 and 1665000291, this component ensures optimal performance and reliability. For identification, please provide your VIN during the order process.

Specifications

Specifications for Coolant Reservoir Breather Hose / Line 1665001091
Fits Vehicle ModelGL450, GL550, GL63 AMG, GLS550, GLS63 AMG, ML550, ML63 AMG
Fits Vehicle MakeMercedes-Benz
OEM Part No166-500-10-91 (1665001091)
Compatible OEM Part No 166-500-02-91
CategoryRadiator / Coolant

Compatible Vehicles

Fits 23 vehicle configurations across 1 make, 2012-2019.

Check your specific vehicle before ordering. This list shows year, make, and model. Some years have multiple trims or engines that use different parts, and individual listings may have additional fitment notes (e.g. “with sunroof only”). Review the full variant list below, or message us with your VIN and we’ll confirm the match.

Mercedes-Benz

  • GL450 2013-2014 · 2 variants 2 with notes
  • GL550 2013-2016 · 4 variants 4 with notes
  • GL63 AMG 2013-2016 · 4 variants 4 with notes
  • GLS550 2017-2019 · 3 variants 3 with notes
  • GLS63 AMG 2017-2019 · 3 variants
  • ML550 2012-2014 · 3 variants 3 with notes
  • ML63 AMG 2012-2015 · 4 variants 4 with notes
View all 23 vehicle configurations — 20 with fitment notes
Full vehicle fitment list for Coolant Reservoir Breather Hose / Line 1665001091
Year Make Model Trim Engine Note
2012 Mercedes-Benz ML550 SUV 4.7L V8 Turbo 4.6L BITURBO
2012 Mercedes-Benz ML63 AMG SUV 5.5L V8 Turbo 5.5L BITURBO PRIMARY RADIATOR
2013 Mercedes-Benz GL450 SUV 4.7L V8 Turbo 4.7L BITURBO
2013 Mercedes-Benz GL550 SUV 4.7L V8 Turbo 4.7L BITURBO
2013 Mercedes-Benz GL63 AMG SUV 5.5L V8 Turbo 5.5L BITURBO PRIMARY RADIATOR
2013 Mercedes-Benz ML550 SUV 4.7L V8 Turbo 4.6L BITURBO
2013 Mercedes-Benz ML63 AMG SUV 5.5L V8 Turbo 5.5L BITURBO PRIMARY RADIATOR
2014 Mercedes-Benz GL450 SUV 4.7L V8 Turbo 4.7L BITURBO
2014 Mercedes-Benz GL550 SUV 4.7L V8 Turbo 4.7L BITURBO
2014 Mercedes-Benz GL63 AMG SUV 5.5L V8 Turbo 5.5L BITURBO PRIMARY RADIATOR
2014 Mercedes-Benz ML550 SUV 4.7L V8 Turbo 4.6L BITURBO
2014 Mercedes-Benz ML63 AMG SUV 5.5L V8 Turbo 5.5L BITURBO PRIMARY RADIATOR
2015 Mercedes-Benz GL550 SUV 4.7L V8 Turbo 4.7L BITURBO
2015 Mercedes-Benz GL63 AMG SUV 5.5L V8 Turbo 5.5L BITURBO PRIMARY RADIATOR
2015 Mercedes-Benz ML63 AMG SUV 5.5L V8 Turbo 5.5L BITURBO PRIMARY RADIATOR
2016 Mercedes-Benz GL550 SUV 4.7L V8 Turbo 4.7L BITURBO
2016 Mercedes-Benz GL63 AMG SUV 5.5L V8 Turbo 5.5L BITURBO PRIMARY RADIATOR
2017 Mercedes-Benz GLS550 SUV 4.7L V8 Turbo 4.7L BITURBO
2017 Mercedes-Benz GLS63 AMG SUV 5.5L V8 Turbo
2018 Mercedes-Benz GLS550 SUV 4.7L V8 Turbo 4.7L BITURBO
2018 Mercedes-Benz GLS63 AMG SUV 5.5L V8 Turbo
2019 Mercedes-Benz GLS550 SUV 4.7L V8 Turbo 4.7L BITURBO
2019 Mercedes-Benz GLS63 AMG SUV 5.5L V8 Turbo

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