Check Control Retrofit
This guide for replacing brake disks and pads was kindly provided by “Cross-Keys” at diagnostics.org.uk.
Whilst applicable to the Astra H and Zafira, the same principles may apply to other models.
Undo the two 8mm upper retaining screws (one on each side), adjacent to the headlights.
Disconnect the cable from the front temperature sensor, then you should be able to remove the bumper. Another pair of hands would be useful when doing this. The sides of the bumper will need to be disengaged from the body by pulling them outwards and upwards.
In order to fit the washer sensor, a hole needs to be made in the washer bottle. The grommet is a push-fit into the bottle, then the sensor is pushed into the grommet until it is fully home. I measured the diameter of the grommet and it was somewhere between 19mm and 20mm. I would suggest that you measure yours in case there is any difference. I used a hole cutter to make the hole, however hole cutters can sometimes cut larger holes than the stated size, so I would recommend drilling some test holes before doing the real thing. I found an old plastic oil can to practice on.
Once this was done, I put the washing up bowl in place and poured water into the filler in the top, in order to flush out any plastic swarf that may have got into the bottle. There was a little swarf which came out.
The wiring loom can then be fitted onto the sensor and connected into the UEC and an grounding stud.
The coolant bottle just needs draining and replacing with the wiring added. It is worth checking for the connector by the ABS pump as it is sometimes pre-wired.