Car overheating even after replacing temperature sensor and radiator fans won't turn on even after replacing them

Asked by Oct 07, 2016 at 11:09 PM about the 2008 Nissan Altima 2.5 SL

Question type: Maintenance & Repair

Even after replacing the temperature sensor and
radiator fans and putting a new fan relay, my car is
overheating.  But when running the OBD II test the
fans turn on. Can you tell me whats wrong?

4 Answers

65

Has the engine been overhauled? If so check and make sure none of the ports where the water flows between the cylinders are not obscured, check for a blown head gasket, and then I would check the water pump. Let me know if I was any help.also check your thermostat

65

As far as the fans go you could have a bad clutch in your fan assembly.

65

Radiator cap make sure the seal on it is good, and run a pressure check, on it

Engine has not been overhauled, gasket is fine, I replaced both fan relays the fan still wont turn on. But when I do the OBD II test fan turns on and when I unplugged the harness from the cooling sensor. The fans turn on and the cooling sensor is new...however when I test drove the car, it would bogg out and can only go a certain rpm. Can you tell me whats wrong? I put in new fan relays, new fan assembly, and new sensor but the fan only turns on when I do the OBD II test and when I unpkigg the harness from the sensor.

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