Engine code AEG (up to model year 1999)

Fig 1: Exploded View Of Cooling System (Engine code AEG up to model year 1999)

Courtesy of VOLKSWAGEN UNITED STATES, INC.

1 - Upper coolant pipe 

• Clipped onto bulkhead

2 - To heat exchanger 

3 - Connector 

• 4-pin
• Wiring chamber 3 and wiring chamber 4 for Engine Coolant Temperature (ECT) sensor -G62-
• Gold plated contacts for Engine Coolant Temperature (ECT) sensor -G62-

4 - Engine Coolant Temperature (ECT) sensor -G62- 

• For engine control module
• With Engine Coolant Temperature (ECT) Sensor -G2-
• Gold plated contacts for Engine Coolant Temperature (ECT) Sensor -G62-
• Release pressure in coolant system if necessary before removing components

5 - Retaining clip 

• Check seated securely

6 - From heat exchanger 

7 - Coolant pipe 

• Coolant hose connection diagram. Refer to Coolant hose connection diagram 

8 - 10 Nm 

9 - To bottom of expansion tank 

• Coolant hose connection diagram. Refer to Coolant hose connection diagram 

10 - O-ring 

• Always replace

11 - Union 

12 - To top of radiator 

13 - From bottom of radiator 

14 - Oil cooler 

• Ensure clearance to adjacent components
• Note. Refer to Lubrication system components, removing and installing 

15 - 15 Nm 

16 - Coolant thermostat 

• Checking: Heat up thermostat in water
• Starts to open at approx. 86 ° C
• Opening stroke: min. 7 mm
• Removing and installing. Refer to Thermostat, removing and installing 

17 - Toothed belt 

• Mark direction of rotation before removing
• Check for wear
• Do not kink
• Removing, installing and tensioning. Refer to Engine codes AEG, AVH, AZG, BEV 

18 - Coolant pump 

• Check for ease of movement
• If damaged or leaking replace complete
• Removing and installing. Refer to Coolant pump, removing and installing 

19 - Rear toothed belt guard 

20 - 20 Nm 

21 - Throttle valve control module 

• Heated by coolant

22 - O-ring 

• Replace if damaged

23 - To top of expansion tank