Fan stayed on for 10 minutes on a cool night after shutting the car off. noticed that the temperature gauge was reading zero. next morning before driving, the fan came on again. i tapped the relay with handle of a screw driver. fan went off and after driving a bit temperature gauge read normal.
Use plug lube, may have bad connection, fan will stay on until engine is cool, this is because of aluminum heads.
If you think something wrong with relay or relay connection, check it out. Some relays in fuse box may be interchangeable, so you can swap relays to see if problem follows relay. I'd have to look at relays.
SOURCE: My 94 Tracer temperature gauge reads between 3/4
Yes, it is possible the temp. sender is faulty, but I would do a cross check of the actual coolant temperature vs gauge reading using a cooking thermometer in the top of the radiator.
Take care not to get scalded - check it at about 180 to 200 deg.
SOURCE: 2003 impala is it a temp sensor or cooling fan switch
Maybe your radiator is clogged flush it out.
SOURCE: relay switch on cooling fan staying on to long
most of the time it in the fuse panel under the hood
SOURCE: cooling fan kicks on when start of vehicle, the
PCM is probably not getting a signal from the temp sensor, so it's kicking the fans on just in case. Check connector on sensor. If connector is OK, replace sensor. The sensor is mounted on the thermostat housing near the end of the upper radiator hose. See picks of a couple engine examples below. The part is only $11 at autozone.com, and a pic is pasted below. Let me know if you have any questions.
2.4 liter engine:
3.4 liter engine:
coolant temp sensor:
SOURCE: My b14 Nissan vehicle cooling
there are 2 possible broblems
1- the thermostat is not opening to check this let the car run hot and monitor the tempreture of the two radiator hoses, when it get to the point when the heat gauge rises above normal both pipes should be hot to the touch, if only one pipe is hot that means the hot water wont circulate through the radiator to activate the fan switch.
2- There could be air in the cooling system, whilst filling the cooling system remove the top hose to allow all the air to escaspe as you fill the system with air. please note not to open the cooling system cap or pipes whilst the water is hot as it could burn you badly.
Hope this is of some help to you.
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When A/C is requested and the ambient temperature is more than 10?°C (50?°F).
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A/C refrigerant pressure exceeds 1310 kPa (190 psi).
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After the vehicle is shut off if the engine coolant temperature at key-off is more than 117?°C (243?°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.
The engine cooling fan system consists of 2 electrical cooling fans and 3 fan relays. The relays are arranged in a series/parallel configuration that allows the PCM to operate both fans together at low or high speeds. The cooling fans and fan relays receive battery positive voltage from the engine wiring harness junction block. The ground path is provided at G101.
During low speed operation, the PCM supplies the ground path for the low speed fan relay through the low speed cooling fan relay control circuit. This energizes the FAN CONT #1 relay coil, closes the relay contacts, and supplies battery positive voltage from the FAN CONT #1 fuse through the cooling fan motor supply voltage circuit to the right cooling fan. The ground path for the right cooling fan is through the FAN CONT #2 relay and the left cooling fan. The result is a series circuit with both fans running at low speed.
During high speed operation the PCM supplies the ground path for the FAN CONT #1 relay through the low speed cooling fan relay control circuit. After a 3-second delay, the PCM supplies a ground path for the FAN CONT #2 relay and the FAN CONT #3 relay through the high speed cooling fan relay control circuit. This energizes the FAN CONT #2 relay coil, closes the relay contacts, and provides a ground path for the right cooling fan. At the same time the FAN CONT #3 relay coil is energized closing the relay contacts and provides battery positive voltage from the FAN CONT #2 fuse on the cooling fan motor supply voltage circuit to the left cooling fan. During high speed fan operation, both engine cooling fans have there own ground path. The result is a parallel circuit with both fans running at high speed.
Is your vehicles check engine light lit ?
Is the
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