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.
Before you throw more parts at it, see if the cooling system is flowing. After the thermostat opens, both Upper and lower hoses should be Warm / Hot. If both are warm, your cooling system is flowing.
As stated above, 4 minutes is way to quick for a car to overheat especially from a stone cold...
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