To drain coolant: 1. Cabin heat knob on hot, ignition key on start (engine off). Blower fan on low. 2. Remove coolant fill cap. Disconnect lower Radiator hose. Let coolant drain. 3. Remove accessories to access and remove thermostat. 4. Reassemble system and fill coolant mixture containing 50% water and 50% antifreeze. Start engine, heat on max with blower on, and keep filling coolant and squeezing hoses until coolant remains full at max mark. Parts of coolant system are: 1. Water pump 2. Thermostat 3. Radiator and Radiator Fan with Thermostatic switch 4. Hoses 5. Coolant reservoir / expansion tank 6. Pressure Cap 7. Heater Core (inside dash) 8. Antifreeze + Water = Coolant This thermostat opens at 190*F. Most Thermostats are 180 or 190*F. The Thermostat is fully open at 20*F higher than rated temperature. Every 1psi that pressure on water increases you get approximately 3*F rise in water's boiling point. Water boils at 212*F or 100*C at sea level air pressure or 0 psi gauge pressure.
Keywords: bearing01, VW, Volkswagen, Antifreeze, Coolant, System, Maintenance, Water, Pump, Thermostat, Hoses, Pressure, Cap, Engine, MK3, MKIII
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