How to replace thermostat in 2006 Jetta GLI

SOURCE: how to replace a coolant temp sensor on a 2001 vw jetta 2.0

here is a picture of where it's located on your jetta:

SOURCE: 2006 Jetta overheating and no a/c - both cooling fans not working

fans and modules are kind easy to do but you will have to find someone in your area to do them... you might state what town and state yopu are in so people know.

SOURCE: 97 jetta gt 2.0 overheating

if the coolant is full and all the air is bleed out of the cooling system make sure the cooling fans turn on if not then check the relays and fuses and wiring. and if thats ok then use a block tester to check for a combustion leak. you can get a block tester for a parts store you simply install it in place of the radiator cap and run the car the chemical in the block tester will change color from blue to yellow if there is a combustion leak.

SOURCE: Thermostat- 2004 Volkswagon Jetta 1.8

follow the top radiator hose to the engine...it's inside that assembly.
Refill and bleed the air out of the system when you replace the coolant.

SOURCE: how do you replace rear rotors and brake pads on 2006 Jetta

There is a special tool you need to do this. It is virtually impossible to do without this tool. I got mine from Harbor Freight for $20. the kit comes in an small orange case and has multiple heads and it pushes and turns at the same time. Do not use a C-clamp, it will damage the piston. This tool still does use some manual labor, but it is worth it when you save a few hundred dollars doing it yourself!