Audi A3 Quiz
Engine Cooling System

Cooling System Pressure Test

In this manual: Engine Cooling System
Owner's Manual — 42Routine Care and Maintenance — 32Engine — 22Engine Cooling System — 9Ventilation, Heating and Air Conditioning Systems — 11Fuel System — 9Fuel Injection System — 4Diesel engine injection system — 5Exhaust System — 9Electronic Ignition and Fuel Injection Control System — 6Charging and Starting Systems — 12Manual transmission — 12Clutch and Drive Shafts — 6Brake System — 13Front Suspension — 5Rear Suspension — 6Steering — 7Body — 70Body Electrical Equipment — 37Wiring Diagrams — 35
~1min read

GENERAL INFORMATION

The system tightness and the operation of the pressure relief valve in the radiator cap can be checked using tester 4800-1.

PROCEDURE

1. Warm up the engine until the gauge indicates normal coolant operating temperature.

CAUTION

When the engine is hot, before opening the expansion tank, cover it with a thick cloth to prevent ejection of hot fluid and vapor, which may cause burns. The cap may only be opened when the coolant temperature is below +90°C.

2. Install a pressure tester, e.g. HAZET 4800-1 with adapter 4800-, onto the expansion tank neck.

5.

3. Use the tester's hand pump to build up an excess pressure of approximately 1.0 bar and maintain it. If the pressure drops, visually check the system for leaks and eliminate them.

4. To check the pressure relief valve, install HAZET 4800-1 tester with adapter 4800- onto the expansion tank cap.

5. Use the hand pump to build up excess pressure. The pressure relief valve must open at 1.4 – 1.6 bar.

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A quick Audi A3 quiz: every answer comes with an explanation and a link to the manual page.