vs
Thermostat Wahler or OEM Volkswagen
Reviews
It has been two weeks since the repair without issues, so I am going to call this one solved. If I was paying for this out of pocket in the future, I would only replace the thermostat and not the pump as that is what was closing and causing the issue.
Pros: repair without issues
Vehicle:
Volkswagen
Spend slightly extra and get a quality OEM Wahler thermostat.
Pros: high quality OEM
I did the timing belt water pump thing on my MK4 last year, and shortly after the test drive with fresh genuine VW antifreeze and while patting myself on the back for a job well done it occurred to me that I hadn't changed the thermostat. Sure enough a month or so ago when the first of the really cold whether started around here the temp gauge would only get to about halfway to normal during a trip to town and back. I tried the ol' cardboard in the grill routine for a couple of days until I got a chance to change the thermostat and that brought things back to normal.
Pros: brought things back normal
Cons: temp gauge halfway
Vehicle:
Volkswagen
Got the Wahler on my 2008/2011 and it was identical to the MB part except the area that had the MB logo on the original one was ground out.
Pros: identical to OEM part
I've had the thermostat on my M272 engine replaced by an indy mechanic. OEM was Wahler, looking at the original the the Wahler I got, the only difference was the spot where the MB logo was on the original, it was grounded out by some grinding disk on the replacement one.
Pros: identical to OEM part
My 2007 MKV 2.5 Jetta is still having overheat problems even after changing the tstat to a OEM (Wahler) and the waterpump to one with metal impeller, which works way better than the original.
Pros: metal impeller works better
Cons: still having overheat problems
Vehicle:
Volkswagen Jetta
I've replaced my thermostat with a new wahler one and I have the same problem which is that it openes at around 70°C and cools my engine to almost 50°C, from what I understand the thermostat is mechanical and electronically assisted to open faster/wider
Cons: opens too early, cools too much
Vehicle:
BMW
I just replaced the original thermostat at 90,000 miles because at highway speeds it would run slightly cold and took a while to warm up from cold. The new wahler replacement takes just as long and will actually run cold intermittently when not on highway. Occasionally it won’t deviate from center on the highway.
Cons: runs cold, slow to warm up, intermittent cold running
Vehicle:
BMW
Mileage: 144841 km
My tstat is wahler. People said that it was better than Mahle. But I found it similarly poor.
Cons: similarly poor performance
Vehicle:
BMW
After getting mine back together, and filling it back up with coolant, i found the new thermostat from the dealership was stuck wide open and the car wouldn’t get over 110*F.
Cons: stuck wide open, car wouldn't heat
Vehicle:
Volkswagen Passat
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