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+--- Thread: Checking thermostat functionality (/showthread.php?tid=734)
Checking thermostat functionality - Sven’s Owner - 01-03-2025
Hi all- I’m looking for some help troubleshooting the thermostat in my 2019 S60 T6. I’ve been using the Car Scanner app to monitor fluid temps for a while and have noticed my coolant isn’t quite getting up to what I consider normal temperatures. In the warm summer months with the AC on, it usually runs about 174F and the engine oil temp usually doesn’t go above that. Now that it’s cold out, it’s usually in the 150’s F on long highway driving. When it’s really cold it’ll drop below that. I’ve noticed that if I turn the heat off completely it will get up around 185F, but will not get that high with the heat on. I did some digging on the tech specs for my car and the target thermostat temp is 90C (~195F) unless it’s in Polestar mode where it has a heated function that opens the thermostat more to keep the temps cooler. My coolant never gets that high normally. My fuel efficiency hasn’t been that great this past year and I’m somewhat concerned about getting the oil hotter to evaporate water, etc..
Does anyone happen to know of any DID’s I could use to see if the thermostat is opening and closing properly? I asked the dealer to look into it at its last service but they didn’t, so I’m hoping to dig into a little more on my own. Worst case, a new thermostat isn’t very expensive and looks pretty easy to replace if it comes to it. Thanks.
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Checking thermostat functionality - Sven’s Owner - 01-15-2025
Update: I never did find any DIDs specifically showing that the thermostat was opening or closing, but I didn’t look at every parameter and could have missed it. But I did end up replacing my thermostat assembly and my car is now running much warmer and hovering around the 195F mark. The old one was not closed when I pulled it, so it was definitely the issue. It was an easy job, but time consuming because you have to pull the intake manifold. The hardest part was opening the radiator drain and vacuum filling it back up. That and figuring out who will take my old coolant.
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