Question about 2005 Nissan Sentra

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No heat fan works, radiator full, good fuse, no heat, engine overheats

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Over heat is caused by poor circulation of coolant. This problem can be: 1- The thermostat is not opening ( bad) causing coolant stagnant. 2- Water pump is bad, not circulate coolant. 3- Radiator is clogging up. It is full but water can not going through small clogging up tubes inside to have heat dissipated through the fines.
Since you also have no heat then I think the bad coolant causing the heater core clogged up also, unless the heater valve has a problem not allowing cooling flowing through the bypass hose to the heater core. Correct all 3 things above then you should be OK. Good luck.

Posted on Dec 13, 2009

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if the fan does not start up by the time it over-heats, then check the thermo-time switch with an ohm meter.

(high ohms while cold, good. low ohms while hot, good.)


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