98 s70. What is this coolant hose clamp and how do I remove it

[Sveedy]

I think that's a cool clamp. Definitely a heavy duty little cuss. Worth keeping.

[abscate]

7mm is a 9/32 Imperial I think ??

Use closed banded clamps on this stuff to protect the hoses. They need to be pretty tight so Torx or hex heads are much beefier than slotted screws

[coop]

Slightly between 1/4” and 9/32. I’ve been having that fun trying to find vaccum lines at the auto parts store since there’s so not many metric options.

[MoVolvos]

Slightly between 1/4” and 9/32. I’ve been having that fun trying to find vaccum lines at the auto parts store since there’s so not many metric options.

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As long as it's close and won't collapse with heat you should be fine. To stretch or not to stretch in terms of sizing availability is the question.
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[MoVolvos]

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The grooves indicate some kind of worm gear on band grooves rather than the bolt and nut which is a smooth band.
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[coop]

Slightly between 1/4” and 9/32. I’ve been having that fun trying to find vaccum lines at the auto parts store since there’s so not many metric options.

.
As long as it's close and won't collapse with heat you should be fine. To stretch or not to stretch in terms of sizing availability is the question.
.

The 5mm or close to 5mm tubing they carry is meant for windshield wiper fluid. It works but it’s a pain in the ass to work with trying to get the turbo vac lines replaced on the engine side. I ordered some silicon tubing but the oem Volvo stuff seems way better for this application and for ease of use.