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lets start with is your initial cam timing set correctly? as far as the fault, this seems to be a function fault, not electrical. the ecm needs to see a timing change when the adjuster is energized. when you changed the solenoid did you replace the whole thing with the chain tensioner? you may have a mechanical block preventing movement in the tensioner. the tensioner works on oil pressure. there is a scren under the tensioner that can become clogged and stop oil flow.
the top motor is in the lower right trunk below the floor covering. the top will not release unless the trunk is closed and locked. often the wire harness in the trunk hinge breaks or the trunk lock motor binds. i would check these after you make sure the fuses are good. also check for oil under the spare. sometimes the top reservoir leaks, no oil, no op.
if the wheel bearing housing is aluminum the bearing is bolted in with 4 spine bolts. if it is steel the bearing is press fit, no clips or rings just presses out toward the hub side.
address the cause of it going bad too. usually overheating or pinging or something may have caused this and may need to be addressed seperately.
the pistons play basketball in detroit. in your engine, they are the parts that get pushed down by the expoding fuel to turn the crankshaft that ultimately moves the car. many things can be wrong in this area but what your mechanic is trying to tell you is the main part of the engine needs repairs which is usually done by replacing the entire engine. by the time your done you'll still only have a 94 vw.
fuse 21 feeds the abs module via the black and green wire. fuse 8 feeds interior lights, vanity mirror light, etc.
is'nt the top switch in the center console? the "boot" will not release unless the trunk is closed and locked. often the wire harness in the trunk hinge breaks or the trunk lock motor binds. there is a manual operation proceedure in the owners manual so not "all" is lost.
a good tech with a diagnostic tester and a pressure gauge can diagnose this easily. there is a compressor cut off condition list that can be checked in block values, temp flap position and sensor readings are also readable. does the a/c pressure go up when the system is turned on? a gauge is needed to answer this.
the dash has to be unbolted enough to gain access to the heater box on the passenger side but not necessarily removed completely although that would make removal easier.
yes there is a relay under the dash position 4 and a fuse in the fuse box. fuel pump fuse 228 gets power from the relay.