In-Transit Heat Cooling System
For chassis used in operations where the cargo must be kept warm by heat from the engine coolant, connections are avail-
able at the back of the engine to connect 5/8" heater hose and provide the necessary coolant flow to the truck body or trailer.
The following illustrations and part number charts show the locations of the coolant supply and return connections, along with
the part numbers for the stub pipes, sealing rings and necessary hardware.
W0113624
Figure 1 — Cooling System Supply and Return Connections — MP8 Engines
Key Qty. Part No. Description
1 2 21087921 Pipe, stub assembly, coolant supply and return (arrows in illustration
above indicate direction of coolant flow)
2 2 20566808 Ring, sealing
3 2 946173 Flange screw, M8 x 1.25 - 20 mm long
Mack Body Builder Instructions CHU, CXU, GU, TD, MRU, LR
USA139046859 Date 5.2017 Body Builder; Engine, MP7, MP8, and MP10 Page 37 (43)
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