Self made tool for vehicles with automatic climate control
Note
A thermostat housing with automatic vent is installed on model 123.1 starting February 1979 (2nd version).
When filling up on vehicles with automatic climate control, proceed as described in sectionย “B”.
Draining
1. Open radiator cap in steps (only below 90c ) .
2. Unscrew drain plug on radiator.
Model 115.1
Model 123.1
3. Unscrew drain plug on cylinder crankcase.
Filling in
a) Vehicles without automatic climate control
4. Fill-in coolant up to mark on radiator filler neck.
5. On models 115.1 and 123.1 (1st version), open vent screw on coolant thermostat housing until cool.
ant flows out.
Model 1 15.1
6. Start engine and run warm. Mount radiator cap.
Model 123.1
b) Vehicles with automatic climate control
4. Slowly fill-in coolant up to mark on radiator filler neck. Do not mount radiator cap.
5. Start engine and run warm up to approx. 40c.
6. Pull-off plug of heating water pump (arrow) on feed line. Connect heating water pump to battery
with self-made tool and push “DEF” button.
7. Run engine warm under intermittent acceleration until thermostat opens.
Note: Mount radiator cap starting at 60c.
8. Connect heating water pump again to feed line.
9. Check coolant level (below 90c) and fill-up to specified level.
