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  1. jw4x4

    Transmission cooler for M939 series trucks, anyone done this ?

    If the engine stayed cool, the fan actuator was likely not engaged due to the temp not being high enough. If this is the case, a remedy would be to install the 2 bolts which lock the fan to the pulley, bypassing the air clutch. The fan runs all the time. Just remove and stow the bolts at the...
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