Questionable Nesting Sites

Just by chance I happened to notice that I had a fully completed robins nest behind the front grille of my car. After some mechanical dismantling I was able to get to the nest and remove it. The car seems the 'perfect' design for a nest for the robin but not for the human...and ultimately the robin family.
I had thought that was the end of it, then, this morning, as I'm sat in my home office looking out the front, I see our friend the robin starting his rebuilding project! The only solution I can think of is to block off the grill for the next few weeks. How many weeks should I continue this for guys?

The egg-shaped holes seem ideal for the robin and there is a lovely void behind with nice structures to build the nest. Seemingly too inviting for the birds to turn down.

Temporary blocking solution. Just got to remember to take it off before using the car!
I had thought that was the end of it, then, this morning, as I'm sat in my home office looking out the front, I see our friend the robin starting his rebuilding project! The only solution I can think of is to block off the grill for the next few weeks. How many weeks should I continue this for guys?

The egg-shaped holes seem ideal for the robin and there is a lovely void behind with nice structures to build the nest. Seemingly too inviting for the birds to turn down.

Temporary blocking solution. Just got to remember to take it off before using the car!
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God loves a trier. ❤️
If you live in Derbyshire, as I do.
I would think a few weeks would be fine - for now. @wild edgesmight know the best timing.
Yeh- just remember to take off your towel....
I live in west central Scotland - not where that photo is...
When OH was learning to fly, one of the standard pre flight checks was looking for birds nests under the engine covers. Apparently it happens quite a lot, even when the plane is in frequent use. Luckily they usually only get time to part build it before it’s discovered.
I had visions of him jumping off a wall and flapping his arms vigorously😏
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I live in west central Scotland - not where that photo is...