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Bad Transmission Causing Engine to Overheat?

  

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My name is Andrew and I have a 2015 Subaru Forester 2.5i. It has 210,000 miles on it. I replaced the transmission fluid about 50,000 miles ago and since then I’ve had some interesting situations with the transmission. It was jerking into gear so I added more fluid. That seemed to fix it for a while. In 0 degree weather last January I was driving up a hill and the car jolted and my hill climb assist, traction control, abs, and at fluid lights all came on…along with my check engine light. I didn’t have money to fix it and it seemed to drive alright so I thought maybe it was just a sensor or something. About 10,000 miles ago it started overheating. I replaced the water pump and thermostat…still overheated. I replaced the coolant temperature sensor…still overheated. I replaced the radiator and fans…still overheated. I rented a pressure test kit and found leaks in the coolant crossover pipe where the o-rings had failed…I replaced those…I drove it on the highway for about an hour and it seemed to run fine…until I got off the highway. Then it overheated. Mind you the transmission lights that I mentioned earlier are all still on, including the cruise control light which disabled my cruise control. I finally tooo it to Firestone to have them look at it. They couldn’t get the car to overheat when driving it around town so they told me it was probably my transmission overheating which was causing my engine to overheat after driving long distances. I really don’t want to replace a transmission unless this is a probably cause for my engine to be overheating. What are your thoughts? Thanks Scotty! 


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Well, of course I'd have to see it to give a perfect diagnosis. But they are correct. If your transmission is overheating, it will make your engine overheat because your radiator has a transmission cooler built in and all that extra heat would make the radiator overheat too. So you'd have to pinpoint down the original problem. But before you start thinking transmission, try my video how to tell if your head gasket is blown Scotty. It's on YouTube cuz those things often do start to blowhead gaskets


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