How do I test a block heater cord?
How do I test a block heater cord? How to Test a Block HeaterPlug in your block heater on a cold day. Unplug the block heater cord and pull it out and away from the vehicle. Set a multimeter to the "ohms" setting, then touch one probe to each of the prongs on the block heater plug and read the resistance. How to test a Chevy Duramax block heater? 4. If the customer is using the engine coolant heater in ambient temperatures above -18°C (0°F), then replace the original coolant heater cord with the thermostatically controlled engine coolant heater cord,...