Volkswagen passat 2013 thermostat replacement... my mechanic says I need to replace both one has already been done,do anyone know how and where the bypass thermostat is located on Volkswagen Passat se

SOURCE: Volkswagen passat 96 AC relay location

You should never connect a 12volt to the compressor solenoid.unless you unplug it first, because on some cars the ac solenoid is driven by an electronic circuit. Semiconductors are very sensitive to excessive current. I once had to repair the computer on a mercedes because the other mechanic did that. Luckily I know how to repair electronic circuits, or they would have bought a 500 dollars computer the little chip that blew only costed a dollar fifty cents at radio shack,.LOL. Anyways back to your problem, Have you checked if there is a leak, and all the refrigerant might have leaked out? This would prevent the compressor from coming on. Along the ac line there is a switch, sometimes by the reciever drier, when the system looses refrigerant the pressure inside drops and that pressure switch disable the compressor. , and the compressor wont come on. This is to protect the compressor, because it will be damaged if you run it without refrigerant. Ac clutch solenoid is usually is not driven by relay, because an ac solenoid don't really take much current to to kick in, unless of course it is shorted. It would either be directly from the inside switch usually in series with the fan control or driven by a small transistor in a circuit, and the electronic circuit is driven by the ac controls inside. I think the problem with your ac is that it has no refrigerant thats why the compressor wont come on.

SOURCE: 1999 volkswagen passat 2.8 v6 4d gls

you have to get special socket that made for o2 sensors you can get local part store and you have to know which sensor you have to replace.

SOURCE: NEED A RADIO CODE FOR A VOLKSWAGEN PASSAT 2001

Phone VW and give them the vin number of your car and they will give you the code for the radio

SOURCE: I need to replace the thermostat in my 2002

Yes you can repair the thermostat by yourself, I have done it. Assuming that you have a V6, because you did not say if it was a 4 cyl or 6 cyl. If it is a 4 then it will be easier, and the thermostat is on the driver side at the bottom of the water pump housing.
A V6 does require that you place the front panel & radiator into service position. To do this you need to remove the plastic engine cover under the car, and the plastic in front of the wheels in the well. Now, the hood release must be detatched. The power steering hose that runs to the bottom of the radiator set to the side, but not removed. The front of the car is going to come off, and the bumper. Drain the radiator, and disconnect the two hoses at the top next to the spill over resevoir.
The manual says to use two long dowels to support the radiator and its support panel, but I found that a floor jack works best, and since you do not really need to raise the car for this job, I find it easier not to. Just open the panel from one side, and leave the air conditioning side all connected. This will give you lots of room to work with. It make take you a little bit at first, but you will get fast at it. This is how you work on this car with tons of space.
The thermostat is on the front of the engine block, inside the hose, just pull the hose off, and remove a few bolts on the cover. Make sure you have a new O-ring to go with that thermostat.
No doubt that getting the car into service position, with the radiator panel away from the car, but it allows for you to get your tools in with leverage. Unfortunately, this job would be a snap if it were not for the fact that you have to put it in service position, nut other jobs it will help. You will need to take off the drive belt for this job, for access. It is not a problem, just replace it while you are there, if it is worn at all.
This job will take me 3 hrs, and I have done it many times, but I am slow. Be prepared to work all weekend if you dont have a manual to follow. They can reveal every screw and bolt.

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SOURCE: Volkswagen Passat rear bumper removal

all the screws/bolts are underneath the plastic cover.hex head.(allen key)