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Mack MRU - Radiator Pressure Cap; Thermostat

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MAINTENANCEANDLUBRICATION37
RadiatorPressureCap
AteveryCandDinspection,checktheconditionoftheradiatorcapgasket.Also,
pressuretestthecapusingasuitablecoolingsystemandradiatorcaptester.A16-psi
pressurecapiscurrentlyusedonallMACKTrucks,Inc.,modelchassis.
Thermostat
Checkthermostatoperation,particularlyduringcoldweather,tomakesurethe
thermostatclosesfully,doesnotallowanyleakageanddoesnotopentoosoon.Also,
thethermostatsealshouldbecheckedforleakage.Coolantleakingpastthethermostat
cancauseovercoolingandmayresultininsufcientcabheat.

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