90 Quattro 20V (Canada) L5-2309cc 2.3L DOHC (7A) (1989)
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Heater Core: Service and Repair
REMOVAL
Heater/Evaporator Housing
1. Disconnect battery cables and remove battery.
2. Discharge refrigerant system.
3. Remove center vent/control panel.
4. Remove instrument panel.
Heater/Evaporator Housing Coolant Hoses
5. Clamp heater hoses A and B to prevent excess engine coolant loss.
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A = return to water pump.
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B = feed to cylinder head.
6. Loosen clamps and remove hoses from fittings.
7. Cap hoses.
8. Remove A/C refrigerant lines from evaporator.
Air Plenum Cover
9. Remove right side air plenum cover.
10. Remove outside temperature sensor B.
11. Remove mounting bolts A.
12. Remove air intake.
