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This procedure is basically intended for Bosch injected cars. Earlier cars do have the bleeder port on the water pump, but of course do not have the additional bleeder on the throttle body. At any rate, please follow this procedure when refilling the cooling system on your Alfa Spider:
1. Remove vent screw on water pump.
2. Loosen vent screw on throttle body
3. Open heater valve
4. Pour 50% antifreeze/50% distilled water mixture through radiator filler until coolant flows out of water pump vent hole. Replace vent screw on water pump.
5. Resume filling until water flows from vent on throttle valve.
6. Start engine and run at idle speed until all air remaining in engine is expelled. Stop engine.
7. Tighten throttle body vent screw.
8. Top up radiator and install radiator cap.
9. Fill reservoir bottle to maximum level shown on side of bottle and install reservoir cap.
10. Start engine and check for leaks.
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