V8 Quattro V8-3562cc 3.6L DOHC (PT) (1990)
Throttle Full Open Switch HVAC: Testing and Inspection
Before performing electrical tests, see test conditions.
Use the Following Tools When Troubleshooting The Climate Control System
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Hand vacuum pump (US 8026 or equivalent).
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Digital multimeter (US 1119 or equivalent).
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LED test light (US 1115, VAG 1527a or equivalent).
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Auxiliary test set (VW 1594 or equivalent).
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Digital potentiometer (VAG 1630 or equivalent).
Test Conditions
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Fuses OK (check according to wiring diagram).
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Ambient temperature above 10°C (50°F).
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Engine at normal operating temperature.
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Vehicle not parked in direct sunlight.
NOTES:
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When the kick-down is activated, the A/C compressor is switched OFF for 12 seconds.
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The A/C kick-down function is controlled by:
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Manual transmission - via transmission switch, 1st gear (F15) and full throttle switch (F81).
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Automatic transmission - via automatic transmission control unit (J217) and kickdown switch (F8).
Procedure
Kick Down Function, Chart 1 0f 2
Chart 1 0f 2