1. Climate control valve is not fixable. It must be replaced and they cost about $400. If you intend to keep the car for a long time, I suggest you replace it. You will have to bypass the climate valve and it will be difficult because of how the hoses are connected .

2. I don't quite understand what you mean by head-to-injector junction. Check the fuel return lines that go from injector to injector. That is about the only thing that can leak in that area.

3. Motor mounts probably have been this way for some time so should make it home but they might cause a serious vibration.

P E H