. SAFETY GENERAL PRECAUTIONS PREVENTION OF BURNS the cap or plug. 2 - 13 Hot To hen checking or draining the coolant, wait for the wate r to cool t o a temperature where it is possible to touch th e r adiato r cap by hand before starting the operation. Even whe n the coolant has cooled down, loosen t he cap slowly to reliev pressure inside the radiator befor Hot oil To when checking draining the oil, wait for the oil to cool to a temperature wher e it is possible to touch the cap or plug by hand before starting the operation. Even when t or plug slowly to relieve he oil has cooled down, loosen the internal pressure before r the cap emoving