Question about Nissan Quest

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Electric fan does not come on for radiator. Everything checks out, is there a way I can jump the fan to see if it is operational at all.

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  • stumpid Jul 24, 2008

    lunker 1958

    Thanks for your tip.
    Is that two seperate wires, one to the pos. and the other to the neg.on the battery.? If so, there are acctually three prongs in the plug to the fan. Looking like an upside down triangle, two side by side, one brown with an orange stripe and one brown with a yellow stripe, and the bottom of the triangle point being black. Again thank you.



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Pull the plug to fan get some speaker wire split both end of wire about 12" in attach wires to battery then touch the other wire to fan there should be two prongs it dosen't matter

Posted on Jul 24, 2008


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I have had my radiator flushed, themostat replaced, new radiator cap, my car was fine for about 4 weeks then started running hot again..2007 Pontiac torrent Awd

experience has proved that flushing a radiator is a waste of effort
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What could cause my 93 Chevy Cavalier to overheat? I just put in a new water pump and a new thermostat but it still tends to overheat and now has a leak from the thermostat intake hose.

We need rule out a few basic things to properly diagnose the overheating problems.
Step 1:Do you think?there is enough antifreeze in the radiator? Don t just look inside the plastic overflow bottle only, you should remove the radiator cap and then look inside the radiator.We should see the fluid level whether it is at its proper level or not. Most cars and trucks will hold a mixture of coolant and water .You should have the cooling system pressure tested for a leak if you have to add more than a pint of fluid .If we see any obvious fluid loss in the engine compartment or on the ground , we should also have the system tested.
Step 2:If you don not see any coolant leak or low fluid level , then you should determine when the overheating problems occurred.If the engine overheats only at a stop or idle ,Most front wheel drive cars will use an electric cooling fan motor located in front or behind the radiator. The existence of function of the cooling fan is to improve airflow across the radiator at stops and low speeds.The fan is controlled by sensors,it regulates the engine temperature and additional load that might be placed on the engine.The cooling fan is required by the air conditioning compressor to operate at idle when the compressor is on.It is a quick way to check the cooling fan operation to turn on the air conditioner.
Also the cooling fan should come on with the air conditioner compressor. Some automobiles will have two electric fans, one is the air conditioner condenser fan and the other is for the radiator .It will have a belt driven fan blade and fan clutch if your vehicle does not have an electric cooling fan on the radiator . This fan should be pulling a large amount of warm and hot air across the radiator onto the engine to keep it cool.The radiator fan is usually closer to the middle of the radiator. The radiator fan is responsible for cooling of the engine, while the condenser fan is responsible for increasing air conditioning efficiency at idle and low speed.If there is ample airflow across the radiator at idle. The radiator is responsible for the primary heat exchange for the engine, and airflow is crucial at this time.
Step 3:Again, we have ample airflow across the radiator, so we must inspect the proper antifreeze circulation.If there is a restriction in the system , it will produce the same affect.Water calcification can accumulate in the radiator and then drastically reduce the flow of coolant at a very high speed. Removing the radiator from the vehicle are the only two real cures for a clogged radiator.It be a waste of time and money trying to correct a restricted radiator when you use a can of radiator flush additive. Of course there are more technical issues that could produce an overheating problems, but the check list described above will identify the most common.Anything you can do to help the mechanic to deal with the problem will probably result in less diagnostic charges, and it might help insure a proper diagnosis of the problem at once of your 1993 Chevrolet Cavalier.
Step 4:You must inspect an electric motor cooling fan ,it will start with ignition key switch off, it has failed and needs to be replaced if the 1993 Chevrolet Cavalier fan motor does not spin freely . The electrical system operates the fan needs to be tested,If the fan motor "freewheels" that . Start the engine and then turn the air conditioner to the coolest setting, if your automobile does not have an air conditioner skip this step.The car air conditioner will operate the 1993 Chevrolet Cavalier cooling fan should activate within five minutes , the fan motor fuse must be checked first and the fuse condition is good the remainder of the electrical system must be checked.
Step 5:A wiring schematic is needed to further troubleshoot this problem ,which is located in a repair service manual. You may use the wiring schematic to trace the circuit through the fuse and relay components, if everything of 1993 Chevrolet Cavalier tests fine, the fan motor has failed and needs to be replaced. The most common repair is the cooling fan motor failure.
This isn't only theory. You can take these steps into practice.You can deal with the 1993 Chevrolet Cavalier overheating problems yourself.

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Chrysler 2006 pt cruiser overheating

Check some of the simple things like coolant level and leaks under the car or under the hood. Then have your car running and observe the front Electric fan by your radiator.

When the engine starts to get hot, this Electric fan should turn on. You may also be able to have the fan turn on when you set your A/C to work. Different makers prioritize different controls and some offer a 2 speed fan design to help when things are really hot.

The Electric fan is suppose to be turned on by a temperature sensor. The sensor will activate a Relay which provides power to the Electric radiator fan. You can obtain a wiring diagram and a fusebox layout drawing by going to and registering your vehicle for free.

Once you have these diagrams you will know what size fuse the Electric fan uses and where it is in the Fusebox. You can take off the radiator Electric fan for testing or just jump some power to it to find out if it is bad.

For the rest of the controls like the Relay, you can use a Voltmeter to trace where the power stops, then fix that part. Remember that for testing the Relay, the Ignition should be on.

The next reason for overheating is a stuck thermostat in the water system. You would need to follow the big hose coming off the top of the radiator and running to the engine. The thermostat should be contained in this housing.

Finally, it is not impossible for the Radiator to go bad and clog up. But manufacturers using aluminum engine parts often have trouble free aluminum radiators.

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The variable speed radiator fan is controlled by the Powertrain Control Module (PCM) by way of a Pulse Width Modulated (PWM) signal. The duty cycle ranges from 30% for low speed operation then ramps-up to 100% for high-speed operation. This fan control system provides infinitely variable fan speeds, allowing for improved fan noise, A/C performance, better engine cooling, and additional vehicle power.

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1. you're paying for their experience and knowledge.
2. you can fix it yourself if you research electrical circuits go buy a muti meter and spend some time.

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now whose going to pay me? lol :)

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