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19Cooling System
Edition 11.96
Coolant mixing ratios ⇒ page 19-3.
Inspecting cooling system for leaks ⇒ page 19-8.
Note:
Always replace seals and gaskets.
1 - Expansion reservoir
2 - Intake manifold 3 - Connection fitting with throttle valve
control unit
4 - Heat exchanger for heating system
5 - ATF cooler ♦ Only on models with automatic gear- box
6 - Radiator ♦ After replacing, fill entire system with fresh coolant
♦ Removing and installing⇒ page 19-9
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19Cooling System
Edition 08.96
Testing cooling system for leaks
Special tools, testers and aids required
Cooling system tester V.A.G 1274
Adapter V.A.G 1274/8
Adapter V.A.G 1274/9
Test condition
Engine at operating temperature
Test procedure
- Open cap of coolant expansion reservoir.
Important! Hot steam may escape when the expansion re-servoir is open. Cover over cap with cloth and open
carefully.
- Mount tester V.A.G 1274 with adapter V.A.G
1274/8 onto the expansion reservoir.
- Operate the priming pump of the tester to produce a pressure of about 0.1 MPa.
- If the pressure drops, locate the leakage point and rectify.
Testing pressure relief valve in cap
- Screw cap onto the tester using adapter V.A.G 1274/9.
- Operate the priming pump of the tester to produce a pressure of about 0.15 MPa.
- The pressure relief valve should open at a pressure of 0.12 ... 0.15 MPa.
