90 Quattro 20V L5-2309cc 2.3L DOHC (7A) (1990)
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Heater Control Valve: Service and Repair
Heater Valve (Vacuum Unit And Coolant Check Valve)
1. Open cap on overflow reservoir.
2. Disconnect coolant hoses.
3. Remove heater valve.
4. Install heater valve.
5. Open coolant bleeder screw.
6. Fill with coolant to maximum mark on overflow reservoir.
7. Close bleeder screw when coolant comes out.
8. Install cap on overflow reservoir.
9. Connect hoses to vacuum unit on heater valve.
10. Run engine until radiator fan comes on.
11. After cooling, check coolant level.
