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On a Jeep 4 cylinder if you bypass the heater core or block the heater hoses of the engine over-heats. Its in parallel with the radiator, but does not get controlled by the thermostat. I finally stuck a valve in the hose to meter the flow until I got the new heater core in.
Later model jeeps (89 and up) dont use the old valves, they use a damper that blocks the heater core out of the air flow through the duct exactly like a chevy pickup.
I use a cheap harbor freight IR gun to check temps.
Dave
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If it has a motor its worth playing with.......
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