I got a new cap and expansion tank hose. I don't think that this was the issue as I still had fluid pooling around the cap.
When I went to change the expansion tank hose O loosened the radiator cap to relieve the pressure. When I took the expansion tank hose off of the thermostat housing fluid kept coming up out of the nipple.
Car was cool (hadn't been run for 3 or 4 hours. Where is the pressure coming form that would force the fluid up out of the thermostat hosing nipple? particularly after I vented the system at the cap.
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