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Re: 1992 k1500 cooling system and missfire issues
the temp sensors may be different. using the wrong one for the guage will mess up the reading.
when operating at high elevations you must have the proper working radiator cap. with no coolant pressure at high elevations the coolant will boiL at less than 212 deg f.
you may have air or worse exhaust in the coolant. this will cause erratic temps.
sometimes using a slightly low thermostat is required like 180 deg f instead of the 195 degf. going higher is mountain country is asking for trouble.
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