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Home >> Jeep >> 2009 >> Commander Overland, 4WD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Engine & Automatic Transmission Cooling System >> Engine >> HEATER, Engine Block >> Diagnosis and Testing >> Engine Block Heater

Engine Block Heater

Fig 1: Engine Block Heater - 4.7L Engine
GC0118272Courtesy of CHRYSLER LLC
1 - ENGINE BLOCK HEATER

If the unit does not operate, possible causes can be either the power cord or the heater element. Test the power cord for continuity with a 110-volt voltmeter or 110-volt test light. Test heater element continuity with an ohmmeter or a 12-volt test light.

CAUTION: To prevent damage, the power cord must be secured in it's retainer clips and away from any components that may cause abrasion or damage, such as linkages, exhaust components, etc.