Thanks for the replies.
I've had to bypass the oil cooler for the moment, as it's leaking oil into the coolant, but the thermostat would still control the engine temperature I would have thought?
I'm using the OBD through the odometer, so the only other thing would be the temperature sensor, but it's not erratic.
My blue ZT-T190 behaves perfectly. Stays pretty much spot on 90 degrees once up to temperature.
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