Bosch GV 630 S Repair Instructions page 16

Removal
Open the housing; disconnect the inlet hose; sever the electrical
connection cables; strip the insulation from the ends of the wires; push
the shrink-fit hose over the cable; connect the wires to the insulating
sleeves (1).
After fitting, warm the connectors until the shrinkage process
occurs and the hot-melt adhesive comes out of the ends of the
connectors (2).
Push the shrink-fit hose over the connectors and also warm until the
shrinkage process is complete (3)
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