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I say it again... proper diagnosing will prevent buying parts you dont need. Bring to a qualified shop and replace only what is needed. How much money was saved doing this yourself? And if a shop did this... find another shop!
Easy .. with the proper tools. The whole engine cadle has to be removed and the engine left hanging on a special rig. You will have to remove the engine and trans together or recommend leaving this to a shop with the proper tools.
Blow - by. Check your PCV system for proper operation.
Any "fault" will cause the trans to go into limp mode. Recommend a qualified shop check that out so you do not waste $$$ guessing.
Recommend leaving this one to a professional. I do not know of a "low pressure valve". You need gauges to know the working condition of the system. Only valving is the compressor itself and an expansion orifice. How high is the pressure? You need specifications and proper information to repair.
The rotors are mounted on the hubs. The bearings are inside the hubs. Rotors do not usually make noise. They just wore blinders and did what they were told without driving & diagnosing the real problem.
2 separate issues. Does blower motor work all the time in " heat" mode? If so, not an AC issue but a blower motor circuit issue.
PROBABLY A LOOSE BELT.
A block test( Hydrocarbon presence) should be able to determine head gasket compression leaks.
We recommend resurfacing your brake rotors as long as they are within the safe parameters. Cheaper than new rotors.