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Sounds like you may have a bad radiator. It may be clogged and the coolant is not able to go through it causing it to come out the cap and reserve tank.
Remove thermostat and test it by dipping it in cold water ib an open pot. Heat the water on the stove while observing the thermostat. It shold opel just before the water boils. If it does check the radiator itself for clogging. Also fluch the engine water galleries.
If the system fills via an expansion tank, I would recommend removing the top hose from the radiator and filling the system by pouring the coolant in through the hose until it begins to flow out of the upper radiator port. Reconnect the hose and then fill the expansion tank. That should take care of it.
Suspect you have a loose clamp on a radiator hose or the oil change guy made something leak. There is a tool which is similar to a a bicycle pump in that it pressurizes the water system and your engine does not have to run or be hot to test. Some major auto parts stores may have a loaner.
Its going to stay hot and lose pressure until you fix the leak.
If the thermostat was installed backwards, it won't open when the engine heats up. The spring/sensor should go toward the engine and the valve plate goes toward the radiator. If the hoses stay cold, it points to no water flow as above. Hope this helps!
checked for loss of water? and check oil for tan color
indicating a water /oil mix .
any white smoke at the tailpipe?
and last maybe thermostat sensor is connected with no shorts.
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