DC--I changed out my thermostat last week and was surprised at what a nasty job it was. The two torx head bolts had galvanized themselves into the aluminum head. I had to take it to a garage to get the back one loose that hides under the two fuel lines going to the injectors. Once I had the thermostat housing off I discovered where Volvo had hidden the coolant sensor. It's right below it, and was undoubtedly partly responsible for the bolts galvanizing because of the voltage through that area. What made me arch my eyebrow though was all the corrosion on the two leads going into the sensor. They were both white, as too some of the threads on the two bolts I finally got out. The leads on the coolant sensor are only about four inches long and disconnect, but not on the sensor side. You can't get the sensor out without removing the thermostat cover, and once you do that, it will take a slim open end wrench indeed to remove the sensor. You can cut away the loose black plastic cover around the two wires and use some electrical cleaner to get rid of the corrosion, but it may have already penetrated into the sensor itself. Take some time and go to a wrecking yard with your torx wrenches and remove a sensor from a wreck, or watch as the yard mechanic does it for you, and then replace the one in yours and see if it does the trick. I wouldn't think the sensor would be any different on Canadian models than US, but you never know with Volvo. Get the p/n off the old one if you remove the thermostat cover, and then check around. Best of luck. Dick
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