Thermostat Housing - Removal Engine Disassembly (00-01) N14 Page 0-22 Thermostat Housing - Removal Disconnect the air compressor coolant return line from the thermostat housing. Remove the four capscrews that attach the thermostat housing to the rocker housing. Remove the thermostat housing from the water transfer tube. Air Compressor Coolant Inlet and Outlet Tubes - Removal Remove the coolant tubes to the air compressor, the cylinder block, and the water pump.