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what kind of material are you cutting?
plywood, 2x8?

You suspect correctly.-New rad cap pretty inexpensive-Paul

On older homes with original hardwood floors I used to find tarpaper (roofing Paper)
Between the hardwood and the sub-floor.

You have the right idea. 45 degree joint, drill a dowelplug hole(make sure you have the dowelplug size 1st e.g. 3/8",1/2"), and predrill a pilot hole underneath rail prior to assembly.. Use plenty...

Wood screws, and plenty of 'em.

Ask at home depot for a suitable cleaner, CLR , or something.
I find grout hard to match, I think it would always look like a patch job.
You can get a grout remover, kind of like a small knife/file...

Sure you can! If there are studs behind the panelling. You can buy switch and receptacle box extenders (check local bylaws) to bring the receptacles,switches out flush.
I'd use 1/2" drywall.-Paul

Check coolant level. If low top it up and find the leak.
Assuming the fan is working, warm up the vehicle to operating temp , turn up the temp, choose defrost, and chech the hoses in amd out of the...

Coolant level low. Top it up and see where it is leaking.It blows cold air because no coolant is getting to the heater core.

Replace igniter module, with new.
Tach works runs OK, finally.

Daytime running lights have been required in Canada since 1990.

1990 honda accord 2.2L.. Cranks,but no start /no spark, picked up used dist at wrecking yard , still no start. Went back to wreckers for another used distributor..
Swapped distributors... ran , but...