Q: How to Check and Replace the Thermostat on Jeep Liberty?
A: Before assuming the thermostat is to blame for a cooling system problem, check the coolant level, drive belt tension, and temperature gauge operation. For 4.0L engines, disconnect the cable from the negative battery terminal and drain the cooling system. Remove the air filter housing and upper intake manifold, then remove the thermostat housing bolts and housing from the lower intake manifold.