P20.10-2551-79
Example illustration |
1 | Coolant pump switchover valve |
Overview
This document contains information on:
General
Function
General
The coolant pump switchover valve controls the coolant feed to the coolant pump. It is located on the coolant pump.
Structure of the coolant pump switchover valve |
1 | Coolant pump switchover valve |
2 | Connection for the coolant pump vacuum unit |
3 | Ventilation connection (atmosphere) |
4 | Vacuum pressure supply connection |
P20.10-A056-01
Function
If the coolant pump switchover valve is not actuated, it is open.
The coolant pump is cut-in in the post-start phase if one of the following conditions is met:
Max. shutoff duration of 300 s after engine start is reached.
Post-start phase limit values for intake air temperature and coolant temperature and for total injected fuel quantity stored in performance map of combustion engine control unit have been reached.
Engine speed or injection quantity exceed defined limit value.
"Heating" request for vehicle interior is carried out.