vs
Thermostat OEM Audi or Wahler
I replaced the thermostat myself. It’s in a pretty bad place, hidden under the intake manifold. It took me about 3 hours to get the job done, had to use a mirror to see the screws. Mine was stuck open so the car in winter time wouldn’t even reach 190 F. I bought an OEM Wahler 07K121113B thermostat from Amazon for like 30$, so far has been working great.
Pros: working great, OEM quality
Cons: difficult installation
Vehicle:
Volkswagen Passat
Part number: 07K121113B
the 80c has been running flawless. Only difference is that my coolant stays at 83-94c. It used to get as high as 100 sometimes. Also the 80c part was recommended oe part #
Pros: running flawless, lower coolant temperature
Vehicle:
Audi TT
Part number: 050-121-113-B
Been running the 80 for a month or so. It works great. Car and Temps run flawlessly. Only difference is my average warmed up Temps are 85c. Used to be 95c
Pros: works great, runs flawlessly
Vehicle:
Audi TT
Part number: 050-121-113-B
I installed a Wahler thermostat a little over a year ago and it's still holding strong.
Pros: holding strong, reliable
I finally got around to installing a new thermostat/o-ring/housing and coolant reservoir/cap yesterday. When removing the thermostat, I noticed that the bottom bolt was VERY loose... I had done the thermostat without housing about a year ago now, had never leaked coolant before... My best guess is that I just didn't torque it enough and it slowly loosened, but only when cold (just a guess, but would help explain why no drips when car was running on ramps) and in small enough amounts that I did not notice a puddle on the ground.
Pros: issue resolved, no coolant loss
Cons: bottom bolt was loose
Vehicle:
Audi TT
I had a 96 and have done that job twice, make sure replace the thermostat otherwise it's a do-over several months later because you tried to save $20. Been there etc!! Change the belt, tensioner, water pump and thermostat.
Cons: do-over several months later
Vehicle:
Audi A4
I got the wahler one in 2019, that would explain the really slow leak I have.
Cons: really slow leak
My Wahler thermostat starts to leak after 4 years. It's not a big leak (only a cup a month) but I'd swap it asap.
Cons: starts to leak
Vehicle:
BMW
The current plastic thermostat looks a little more beefy, but is still shatty plastic. They're commonly failing at 30-55k miles in the stuck closed position, instant overheat.
Pros: more beefy look
Cons: shatty plastic, instant overheat
Vehicle:
Audi A6
Mileage: 55000 km
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