When do you hear the sloshing sound, when you turn left ot right or when you give the engine a little gas?
As already mentioned, it could be water trapped in the a/c, if that is the case, your front carpets should also be getting bet.
The other possibility is you have air trapped in your cooling system caused by either a coolant leak or failing head gaskets.
Check you truck over and get back to us.
Mike
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