C70 L5-2.4L Turbo VIN 56 B5254T (1998)
Remove the hose for the water heated crankcase ventilation.
Remove the thermostat housing from the cylinder head.
Carefully clean the gasket face and mating surfaces.
Remove the fuel pressure line.
Checking the opening function of the thermostat
The thermostat can be tested in warm water.
Maximum opening must happen within 2 minutes in water at opening temperature.
Marking ........................................................................................................................................................................................................................... 90°C
Begins to open at ............................................................................................................................................................................................................. 90°C
Fully open at ................................................................................................................................................................................................................. 105°C