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Power window & door locks ?
Possibly the guage unit failed with the normal surge when the replacement was disconnected, it has happened to us, with a miffed customer as a result, things happen with electronics, Plus seeing your vehicle, we have had to send many instrument clusters our for repair of that make, model & year,the servo motors in those clusters are certainly prone to failure. There is an authorized Delco reman facility who repairs those clusters locally, their name is Techni-Car, and they are located in Oldsmar.
sir: Sounds like your Volkswagen my be low on coolant, you cannot depend on the coolant level in the reservoir to indicate the coolant level in the engine itself. If the overheating happens with coolant loss, the engine may have a failed hose radiator, water pump, core plug leaking or a failed headgasket or cracked cylinder head.does the engine missfire and/or have white exhaust ?
To answer your question; would require a systematic diagnosis, which which would certainly cost much less than what you have already spent, and give you a direct path to a solution!
If the overdrive lamp is flashing it should have a Trouble Code in memory, what type of scan tool are they using ? a generic scan tool may not communicate with the transmission information which is available with a better scan tool, such as a Snap-On verus or Autel MaxiSys.
The fuel pump is located in the fuel tank.You said the fuel solenoid has failed ? do you mean one of the evap system control solenoids ? If the fuel pump had failed, the vehicle would not start and run.
The brake light switch is located above the brake pedal, and as several of your respondents have answered, the brake light switch plunger touches a " cushion" which is made of a plastic that crumbles with age, ( you will find pieces of it on the floor mat ), resulting in the brake light always on condition. the light panel on the trunk panel is most likely a led design, and in most cases must be replaced as an assembly.
Vehicle Owner: Possibilities: Ignition system problem, Involving Plugs, Coils, Triggering components, or Fuel Management System Issue, Computer, Including Fuel Injectors, Input Data Sensors, or a Mechanical problem, such as a broken valve spring, and with all of those possibilities, you can see that a Professional Diagnosis would be your best investment to evaluate the vehicle and make an informed decision concerning its repair. Thank You, Garvin @ Crew @ Wrays Auto Service.
The "wrench " indicator means there is a diagnostic Trouble Code in memory, and since your cruise control also has failed, the most likely solution would involve replacement of the " clockspring assembly", but before you replace anything, a complete diagnosis should be done. Thank You, Garvin @ Crew @ Wrays Auto Service.