Thermostat OEM Audi or MotoRad
I use them all the time with no issues.
I just got this done and Audi quoted me $2500 for just the thermostat. Mine was covered by the extended warranty Audi has on all water pumps leaks.
I used one of the MotoRad safety thermostat's that have a 1/16" hole already in them, in my 84. So.. No, I don't think you'll have any problems adding a hole.
the 80c has been running flawless. Only difference is that my coolant stays at 83-94c. It used to get as high as 100 sometimes. Also the 80c part was recommended oe part #
I remembered the old thermostat looking like it did, so I waited a few hours to let the engine cool down then swapped the new thermostat for the old one, turned the engine on and no overheating. I've been driving the car as it is for a while now without any problems other than I can't drive long-distance without it running too hot (ex. I drove 4 hours a couple times a year traveling for college, and in the summer the car sometimes would overheat by the time I got to my destination).
Had a Motorad Fail Safe a few years ago and it was a POS.
Tried a Gates from RockAuto and it was a Motorad in the box. Installed it anyway, it seemed to hold the temp *lower* than the 170 Stant did, and my engine cooled all the way down to cold when I went down a long grade.
I tried a parts store Motorad, failed. Tried a Napa gold stat that turned out to be repackaged Motorad, failed.
Every 6-7 months the cheap garbage scam of a brand Motorrad remains to be the only available thermostat I can access. I do the temp gun test, I verify my sensors are correct. I burp the cooling system. Everything. I’ve gotten so good at the job now. Every brand of thermostat I’ve tried in Canada is a Reboxed Motorrad. Premium to Economy. 7$-25 they’re all the stupid same. Parts source, Gates , Napa , Autovalue , “mopar” from my dealer. All Motorrad at different prices. I know of 2 they make, the standard oe 195 which is usually economy line. And the fail safe one they make. Both have catastrophic failures, either get stuck open, spring blows apart. Usually after 6-7 months they stop working entirely or the thing slowly stops letting the Jeep get to temp and I dread reliving the Motorrad Groundhog Day effect. It’s a garbage thermostat. People have argued with me that they make OEM equivalent parts and they never have issues but I’ve had nothing but issues.
I had to replace mine again after 6 months.
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