Diagnose Engine Cooling Fan Relay Problem

May be bad water pump broken hose heater hose upper radiator lower radiator or a bad radiator itself.

Diagnose engine cooling fan relay problem.

If the radiator core itself is restricting air flow at road speed then maybe the only cure might be to recore it with a lower density core with more air flow area between the fins and tubes. Still the same problems. Either a switched on electric one that has that job or a fluid filled fan clutch and fan on the waterpump. The coolant level remains full so no cracks or leaks in the resevoir tank.

This is a darlington transistor circuit and can fail open or short. They both work fine. I replaced the radiator. But make sure to follow the instructions with the pressure tester as you can.

Because while the lights vary in appearance from vehicle to vehicle all have the same basic meaning. Air must be flowing over the rad. I m not sure if this problem was related to only getting heat through my cabin vents at high speeds freeway so i bypassed the heater core. Installing a radiator core with too high density too many fins and tubes per inch can restrict air flow enough to create this problem.

Replace it with an oem clutch fan from mopar. The symptom usually associated with a faulty fan read more. I believe the most common cause of a radiator fan either not running or running all the time is a failing driver module. A simple pressure tester will reveal the coolant leak.

I checked the fan and fan relay. Follow the instructions on the test of pressure to your cooling system also check for coolant leaks onto the ground from radiator area. Suggest that you rent a pressure tester from auto zone or advance auto and preform a pressure test on your cooling system. There s a problem with the car s emissions system.

Cooling system 875 electrical 1198 engine and related 4458 exhaust 1429 exterior parts and trim 4882 fuel systems 1212 gift and apparel 688 interior parts and trim 4765 performance 1790 steering 599 suspension and chassis 698 transmission and driveline 605 weatherstripping 395 wheels and tires 866 brand. Identifying your particular vehicle its model designation its equipment and any bulletins is important. A broken fan relay means the radiator cannot cool down. Cooling fan relays fail when the radiator cooling fan no longer receives an electrical signal.

If the fan motor does not work there will not be enough air movement through the radiator to dissipate the heat in the coolant.