overheating

Asked by Mar 12, 2010 at 03:03 PM about the 2003 Nissan Sentra 2.5 LE

Question type: Maintenance & Repair

ok i got a new thermastat the fan is working so what would make a 2003 sentra run hot?

1 Answer

955

1) air in the cooling system, usually accompanied by poor heat, run it with the radiator cap off and the heater on untill the heat blows hot, then fill the coolant and put the cap back on and test drive...basically the thermostat won't open unless it's immersed in hot coolant, which it won't be right after installation 2) themostat installed upsidedown/backwards 3) cooling fan only works on low speed, overheats more while city driving 4) something blocking air flow to the radiator, over heats more highway driving or all the time 5) siezed water pump or proken water pump fins, requires visual inspection

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