Box under passenger seat???

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Mar 4, 2010
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The other day I dropped a coin under the passenger seat and I was reaching under there to get it I realized there was a box under there. At first I thought it might be a cd changer but when I looked closer, it is some major electrical component with a couple wiring harnesses going in and even a fan for cooling. Im just curious of what this is because if I go mudding and get water in the cab is this like the brain box fore the truck or something??? What is this for and do I need to water proof it before submerging it?
Thanks
 
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Nov 28, 2009
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since he brought it up, if the button for rear heater is always off will that help avoid the problems with the PHH?

(that was a rec from you wasn't it MShelby?)

I don't think it will avoid the problem since the hose can still go out. I recall you telling me someone mentioned once you can cap off the PHH but I don't know anything about that since I won't have that issue :grinpimp:
 
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The last couple day I have noticed a water sloshing sound when I stop. Could this be the coolant sloshing around in this box? That wouldnt make sense thought cause the water pump should be circulating coolant and there should not be room to slosh because the heater core in the box should be full at all times. Or when the valve for the heater is closed for too long coolant will flow out but not back in with the valve closed? Sorry im ranting but im hopeful this is the sound and not water pooling somewhere in my rig. Thanks
 

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