Lift the front part of the car and place it on jackstands. Working below the vehicle drain the engine coolant and remove the lower splash shield that is beneath the engine. In the case of 1.4L engines, the intake manifold must be removed and the mounting bolts of the oil cooler must be removed followed by the removal of the cooler on the side of the engine. De-assemble the four O-rings of the engine block and fit new ones. Install new O-rings to the engine block, and then fix the oil cooler and tighten the mounting bolts to the required torque. The other steps are the opposite of the removal. Recharge engine oil, coolant, and start the engine and look at leaks. With 1.8L and 2.0L engines, take out the oil filter and unscrew the electrical connectors immediately below the filter. Unscrew the mounting bolt of the oil dipstick tube, disconnect the tube on the timing chain cover and push it forward. Eliminate the fan shroud, air inlet duct and charge air cooler inlet pipe. Unconnect the electrical connector to the air conditioning compressor, and take out the compressor mounting bolts, and fix the compressor out of the mounting bracket of the sub-assembly. Take out the intake manifold support and the alternator of the sub-assembly mounting bracket. Unclip the harness of the sub-assembly bracket, disconnect the electrical connectors of the oil pressure regulator valve and the electrical connectors to the oil pressure switch and take the harness out of the way. Insert the sub-assembly mounting bracket bolts in reverse sequence of installation and slide the sub-assembly forward until the oil cooler-to-coolant pump housing connector is loosened, and then remove the sub-assembly bracket. Take out the oil cooler mounting bolts and remove the cooler out of the sub-assembly bracket. When very much of metal shavings or other debris is detected in the engine oil, wipe the areas of oil channels clean and change the engine oil cooler to avoid further damage. Disassemble and install a new seal to the oil cooler and install the new seal in the grooves of the sub-assembly bracket making sure that it is correctly positioned in the mounting bracket and the mounting bolts are properly installed to the required torque. Mount the sub-assembly bracket to the engine and screw the mounting bolts in turn to the recommended torque. The other steps are the opposite of the removal. Recharge engine oil, coolant, and start the engine and look at leaks.