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Mack/Volvo (OEM) · Engine
21689131
In stock · ships from Knoxville
This is the coolant return hose for the Variable Geometry Turbocharger (VGT) actuator on Mack MP8 engines (2007 and later).
Confirm the part fits before you buy. Applications and interchange numbers are researched and audited per part.
Verified fitment for 2 applications
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All confirmed applications for this part number.
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Northwest Truck lists as 'HOSE VGTACT COOLRET MP8-07'. Autoline listings show it as a cooling pipe/tube for Volvo trucks. Exact cross-ref between Mack and Volvo confirmed by OEM number, but verify fitment by engine serial number.
Part data verified against 2 catalog sources
Numbers this part supersedes or interchanges with. Showing 2 of 2.
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It returns hot coolant from the turbo actuator back to the engine, preventing overheating of the actuator and protecting turbo performance. Over time, the hose can crack, swell, or leak from heat cycling and oil exposure, leading to coolant loss and potential actuator failure. Replacing it restores proper coolant flow and helps avoid turbo damage.
Part Number: 21689131
HOSE
Vendor: McMahon Truck Center
Dealer: KP Services Crossville
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