|
Turbocharger has a thermostat in its water jacket. When you shut off the car the auxiliary water pump runs for 30 seconds. After that, if more heat seeps into the turbocharger from the hot exhaust and heats it to thermostat set point, the thermostat triggers the water pump to run for another 30 seconds. This process can repeat several times.
A single wire comes off the turbo water sensor. If you disconnect and ground it - the end that does not go to the thermostat, the pump will run for 30 seconds. Thermostat just completes ground when it senses too high a temperature.
__________________
Lawrence
1986 951
2002 SLK32 AMG
1987 328GTS
2011 528i
|