I replaced my newly bought Wahler t-stat with my old Mahle but drilled. Temps stays 80-87c.
MAHLE was the last thermostat put in her… no issues happened since then to this day, continues to runs fine, no fluctuations in gauge, or overheating. The dealership even started to have that issue with other customers until we switch to Mahle, solve all thermostat issues.
Swapped to mahle and it's good to go.
I work at a Honda dealership in the mechanic field, and I would recommend the OEM thermostat, unless you have a rebuilt engine.
Stop using cheap thermostats. Get an oem honda unit and it will last and work correctly.
Your temp gauge is reading low because your mechanic is not using an OEM Honda thermostat. An OEM thermostat is designed specifically for your engine and the car will warm up quickly and the temp gauge will sit at the 50 yard line in any weather.
The Mahle thermostat arrived today along with all the other bits I think I need to put the car back together. The problem is that the new one doesn't quite match the old one.
Car takes forever to warm up and seems to always be running rich, so I'm guessing either the thermostat or ECT, or both, is/are bad.
I have the same one in my E53 X5 3.0 and it takes forever in the winter to warm up. I replaced the old one as it was leaking but the new one takes like 10miles to get fully up to temp. If I have a long coast up to a stop the temp gauge will actually go back down.
I just be replaced mine for the low regulating temperature, and the snag seemed to improve, but it will still pop up and the car is slow to hit temp, slower than it was last winter at least.
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