Heard of peoples caps loosening up over time and coming off. All I have done for 13 years is make sure the cap is very tight. Mine has never come loose.
Ya so Basically what Dan is saying is water should go through the Heater Core regardless of what T-Stat is doing. If you have no Heat that equates to Water Pump not Pumping.
I believe you showed Temp of heater hoses being cold and that indicates pump no Workie.
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