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It is quite a chore. The various Volvo forums have detailed instructions, the quick answer is you have to pull the front fascia off the car to get to the lens assembly. Once there, there are some clips that hold the lens on.
how to replace the headlight
Yes they can. The lens are clipped on and have a gasket between the lens and the reflector.
If you're talking about the headlight, the "lens cover" is not a separate part, you need to replace the whole headlight assembly.
I assume you mean HEADLIGHT LENS.. .. there are 3 bolts on the back, remove, pull out headlight. Remove clips and broken lens. Replace gasket, lens and put on clips FRONT TO BACK so you don't chip the lens. Reinstall with 3 bolts on back.
There aren't headlight covers, it all one unit. One of my lens was cracked and I had to replace the whole unit.
Where the lens meets the housing there is a seal, just replace it.
You don't. Instead, you replace the entire assembly.
Forget it. I figured it out.
You must replace entire assembly. If your problem is just foggy lenses, you can get lens cleaning solution at auto parts store.
The lens itself is part of the composite headlight assembly. It all has to be replaced as a unit.
If they're identical, yes. Try it and find out.