Question about 1994 kawasaki ZXR 400

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4 wheeler over heats

Fan works, radiator is clean, how do i test temp sending sensor?

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If you have an ohm meter you can check for Resistance when it gets up to temp. by the 2 prongs on it

Posted on Jun 07, 2009

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I have a 08 nitro that the cooling fan never comes in causing over heating I've replaced water pump radiator heater core because it was bad the relay seems fine power coming in and out but no fan on

check fuses and coolant temp sensor
the coolant temperature sensor unit ( that is SENSOR not gauge sender unit) sends a report to the ecm to turn on the radiator fan when the temp is reached
If the fan is not coming on then the circuit is broken--sensor, wires ,fuses relay, fan-ecm
all have to be checked out

Jan 09, 2017 | 2008 Dodge Nitro

2 Answers

08 Ford Explorer 4.0L - At times the coolant goes through the radiator cap into the recovery tank, filling it, same time temp gauge rises Changed tstat and cap. I think it is a clogged radiator

possible and an accredited radiator shop will be able to do a flow test to check that
unfortunately , it indicates a gasket or cracked problem so have a compression test done to eliminate that
if that test proves good then have the thermostat removed and checked/replaced if the engine runs a viscous fan hub then check that as well
viscous fan hub failure is most noticeable when stopped at lights ( temp gauge goes up but comes back down when moving along the road) temp rises in slow moving traffic , using high engine rpm as in up hill or any condition where the air is not moving through the radiator unless the vehicle has speed
if you have electric fans then the problem may be in the coolant SENSOR unit that sends the temp to the ECM to switch on the fans

Nov 06, 2016 | Ford Cars & Trucks

2 Answers

Hi, i have a 96 sb combo van which overheats and then starts to run like a hairy goat.I have replaced radiator and both temperature sender and receiver. but still doing it.then changed map sensor ,oxygen...

over heating will probably be the cause of most problems as it sends the ECM crazy with so many sensors inputting information
If you have a viscous fan hub then replace it as it is the prime cause of overheating .have a compression test done to check head gasket and cracks
If you have electric fans make sure that they are working
ckeck coolant level at the radiator cap

Mar 12, 2015 | Cars & Trucks

1 Answer

Radiator fans will not turn on.

replace fan switch. depending what make vehicle, it could be located
on the side of radiator, on thermostat housing, on cylinder head.

Apr 03, 2014 | Chrysler Grand Cars & Trucks

1 Answer

Zafira radiator fan

Turning on the heat removes heat from the engine as it blows it on you. Make sure first that there are no air pockets in your cooling system as that can cause high temp reading and malfunctions in proper fan engagement. If that looks good test your fan, if it is working then test the fan relay, if it is working test the temperature sensor that gives the relay the go ahead to engage the fan.

Jan 16, 2014 | Cars & Trucks

1 Answer

Common issues with 1994 buick roadmaster

Has anyone tested the new temp unit to make sure it's functioning properly? Or is their possibly a mechanical thermostat in it that's hung and needs to be replaced?

Apr 28, 2017 | 1994 Buick Roadmaster

1 Answer

My 1996 grand prix started to register cooling temp of over 210 degrees. the motor doesn't seem to be overheating. I've replaced the water pump, thermostat, temp sensor, both fan relays, low coolant...

I would first check the cooling fans. To do this unplug the fans and use two jumper wires to hook them direct to the battery and test. If the fans are working I would have the radiator cleaned or purchase a new one. To clean the radiator take it to a professional and tell them you would like it rodded out. You can purchase a new one for about twice the price. I wouldn't worry about the low coolent sensor. By it being on it will not send a message that your vehicle is overheating. If you have changed everything that you say you have and the fans work and radiator is cleaned you may have a blown head gasket. If you have a blown head gasket you would see steam comming out of the tail pipes or water in the oil on dip-stick. Good luck.

Feb 20, 2011 | 1996 Pontiac Grand Prix

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I have a 1982 yamaha vision 550 and it over heats iv tested the fan by giving it curent and the fan works fine is there a sensor or fuse that might be the problem

There should be a sensor in the bottom of the radiator that senses the water temperature and turns the fan on when it reaches a certain temperature. There is a sensor somewhere and I'm guessing it's in the bottom of the radiator. Jumper across it and see if the fan runs. To test it, you'll have to connect an ohm meter to it and put it in a pan of water. Slowly heat the water until the sensor changes state. Notice the water temp when this happens.

Jul 20, 2010 | 1982 Yamaha XZ 550

1 Answer


If the fan is coming on late, it would nearly reach overheat, then after fan cuts in, the temp should go down. Temp sensor sends a signal to the computer, computer sends a signal to the fan relay, relay completes circuit and turns fan on.
Fan should go on at or just above "normal" operating temp and should be on full - time when a/c is on. Sensor may be slightly out of range, but, I don't understand why shop when testing did not see this and finish the repair....Sensor is not expensive and isn't a terribly difficult item to replace.
Personally, I've found that a problem like yours is more often caused by a partially obstructed radiator...many times flushing goes around not through the obstruction and does not correct flow problem.

Aug 31, 2009 | 2000 Dodge Durango

2 Answers

Radiator cooling fan

Just fixed this problem. Replace the sensor or switch on the thermostat housing and viola!

Sep 19, 2008 | 1994 Honda Civic

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