Volkswagen Golf / Golf GTI / Jetta. Manual — part 67

19-31

Coolant fan, checking

Special tools and equipment

Test conditions

VAG 1594 A Adapter set

Wiring diagram

Main fuses must be OK.

Coolant Fan Control (FC)

Thermal switch -F18- is OK.

Cooling system components, servicing

19-32

Test sequence

- Remove left-hand insulation tray:

Repair Manual, Body Exterior, Repair Group

50

- Disconnect 3-pin connector from Coolant Fan

Control (FC) Thermal switch -F18-.

If 1st or 2nd speeds of fans do not run:

Electrical Wiring Diagrams, Troubleshooting &

Component Locations

If no wiring fault is detected:

- Bridge contact -1- and contact -2- of connector

using adapter cables from VAG 1594 A.

1st speed for Coolant fans -V7- and -V35

start.

- Switch ignition on.

- Bridge contact -2- and contact -3- of connector

with adapter cables from VAG 1594 A.

2nd speed for Coolant fans -V7- and -V35

start.

- Locate and eliminate open circuit referring to

wiring diagram:

- Replace Coolant fan -V7- or -V35-.

Cooling system components, servicing

19-33

After-Run Coolant pump -V51-,
checking

Special tools and equipment

VAG 1527 B Diode test lamp

VAG 1594 A Adapter set

Wiring diagram

Cooling system components, servicing

19-34

Test conditions

Test sequence

Repair Manual, Body Exterior,

Repair Group 50

Checking function

All fuses must be OK.

- Remove center insulation tray:

- Disconnect 2-pin connector from

After-Run Coolant pump -V51-
(arrow).

- Connect contacts of After-Run

Coolant pump -V51- to battery
using adapter cables from VAG
1594.

After-Run Coolant pump -V51-

must start.

Cooling system components, servicing