With engine off check fan blades and shrould (plastic around fan) for cracks or if loose also check tailpipe bent at end if you backed into something. also check air filter box to make sure its tightly shut.
Un hook serpintine belt and see if noise goes away dont run without belt for more than a few minutes
SOURCE: 2003 Jeep Liberty heater fan problem
It is the blower motor resistor. Look under the passanger side dash and locate the fan housing (looks round and black in color. Then locate the resistor it will be in that housing usually withtwo ten millimeter nuts or two simple screws holding it in. unplug the harness to the resistor and remove the resistor. Part store price is approx. 50.00. Note: on aftermarket (not Jeep) resistor sometimes you have to modify the housing a little to get it in. Hope this helps.
SOURCE: how to replace a blower motor resistor in a 2004 jeep liberty
You have to take the glove box off and it is right behind it, need a #20 Torx to take it replace it. The glove box is the hardest part of the job, I just replaced mine on an 05 Grand Cherokee but it didn't fix it for me, was well worth the $8.60 to try though.
SOURCE: 2004 jeep liberty thermostat change?
ihave to change my thermostat in my 04 jeep liberty is it hard
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