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International Automotive Technicians Network
Re: Truck won't warm up
Posted to Technical Discussion Forum on 3/21/2023

This is OBD1, so unless you have a suitable scantool, you have to monitor temperature manually. Does the radiator get warm or can you see flow in the filler neck when the thermostat should be closed? Does clamping off the upper radiator hose improve heater fun... Login to read more.