Monterey V6-4.2L VIN 2 (2004)
Heater Hose: Description and Operation
UNDERBODY HEATER LINES
The underbody auxiliary heater lines have the following features:
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The underbody auxiliary heater inlet line is a aluminum tube assembly that carries coolant from the engine coolant supply line to the auxiliary
heater core inlet.
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The underbody auxiliary heater outlet line carries coolant from the auxiliary heater core to the front heater core outlet line.