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Originally Posted by lincoln_mark_8
there is prob air in the system that would cause the thermostat cannot open. the fans would kick on since there would be a hot area by the sensor. I would run the vehicle and at the top of the engine on the passenger side there is a purge valve. You run the vehicle and open that with the cap off and make sure there is plenty of coolant in the overflow bottle. Your overflow bottle may be defective as well. Mine was and I had the same problems you have. Or you have a small leak somewhere else.
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What does this purge valve look like? Does it have a black cap?
There is plenty of coolant in the overflow bottle. I detect no other leaks.
I was attempting to replace the thermostat while waiting for a replay, but I was unable to get a wrench (13mm) to turn the screw. There is no room to move the wrench,