For what it's worth

Replacing the washer fluid pump on my Astra, I found the instructions lazy - telling you to "release" the radiator grille without telling you how to do it. The pictures are often unhelpful - no context to show where on the car you ought to be looking for the odd-shaped bit that the photo shows so clearly. And to cap it all today - a component that simply isn't mentioned. Taking off the bumper, I found a cable dangling from the front of the car by a couple of blue wires, with a moulded component on the end. Where did it come from? I guessed (correctly) that it was the Air Temperature Sensor - so off to the Haynes Manual - to find that they made no mention of an Air Temperature Sensor at all. Eventually worked out for myself that it clipped into a circular moulding near the centre of the bumper. But not at all impressed by Haynes.