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26 COOLING SYSTEM 2 FAULT DIAGNOSIS ENGINE RUNS COLD Before conducting any cooling system diagnosis: See Description and operation, Engine Cooling 1. Check operation of viscous unit. See Description and operation, Viscous Fan See Repair, Viscous Coupling, Fan Blades, Pulley and Fan Cowl YES - Continue. 2. Is thermostat correct type and operating? See Repair, Thermostat 3. Are the air conditioning fans operating continuously? See Electrical Trouble Shooting Manual. NO - Continue. 4. Is temperature sender and gauge giving accurate readings? Substitute parts and |