Question about 1998 Mazda Protege

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1998 mazda protege radiator cooling fan not working?

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Hi, here is how your system works. The coolant temp sensor get's a reference voltage from the PCM and returns a voltage corresponding to the temp. The PCM then turns on the fan relay onve the temp reaches a certain level. If your coolant sensor is working properly (moving into red or light coming on), then the problem is with the relay, fuse, or the fan itself. Otherwise, it is the sensor.
If the sensor reading is bad, first check the connection to the sensor. If the connection is good, remove the connector and use an ohmmeter to check the resistance of the sensor. It should be as specified below. If not, replace the sensor.
If the sensor indications are good, try swapping the fan relay with another similar relay. The fan realy is usually in a box under the hood--sometimes on the passenger side in front of the shock tower. Finally, if both the relay and sensor are good, use a 12 volt test light or voltmeter to check for power to the fan connector when the engine is running and hot. If there is no power, check the wiring from the fan relay. If there is power, replace the fan motor.
Please let me know if you have any questions, and thanks for using FixYa.

Coolant temp sensor resistance:

-4°F (-20°C)-14.6-17.8 kohms 68°F (20°C)-2.2-2.7 kohms 104°F (40°C)-1.0-1.3 kohms 140°F (60°C)-0.50-0.65 kohms 176°F (80°C)-0.29-0.2 kohms 1998 mazda protege radiator cooling - jturcotte_338.jpg

Posted on Mar 11, 2011

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Posted on Jan 02, 2017

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SOURCE: 2001 Mazda Protege cooling fan or thermostat

the sensor or the fan relay is bad

Posted on Oct 18, 2008

  • 1 Answer

SOURCE: 1993 mazda protege radiator fan stays on

It maybe the fan switch.

Posted on Dec 14, 2009

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1 Answer

I have a 1997 mazda protege with a coolinf fan prob. The fans work when I turn on the AC but do not work when the engine gets hot at idleing speeds. I replaced radiator and thermastate and also cooling...


No, the fans have separate relays. You have to use the wiring diagram to sort it out. The pcm turns on the cooling fan relay with a ground signal on a purple/black wire when the temp sensor signal rises too high.


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Oct 31, 2017 | 1997 Mazda Protege

1 Answer

Fixed every possible cause but still overheating


checked water pump for circulating the coolant?
checked the radiator if the coolant circulated correctly?
thermostat renewed?
thermo switch checked whether is working?
fan switch checked whether is working?
checked whether the matrix could circulate the coolant?
ckecked whether there is any valve on the matrix hoses and is working?
have you bled the cooling system ?
have you checked whether you have a cylinder head gasket with problem and pressurized the water?
checked whether have a cracked cylinder head and on accelaration expanded the water hoses?
have you checked whether the radiator cap is working ok?
have you checked whether the radiator cap is with the correct pressure for the cooling system?
checked whether the cooling fan is working?

Sep 05, 2012 | 2001 Mazda Protege

1 Answer

Where are the cooling fan relays located on a 1998 Mazda Protege?


cooling fan has a heat sensor that controls it and is located on the engine...correct place on that car i do not know but local auto parts store should be able to help you out as to location....hope this helps

Aug 17, 2012 | 1998 Mazda Protege

1 Answer

1999 Protege overheating. Changed thermostat, radiator, water pump and burped the new radiator. Runs fine on freeway, but will overheat in stop and go traffic.


if your vehicle has electric cooling fans it could be that they are not working,if this is the case when you are on the freeway you don't need the cooling fans you only need them when the vehicle is not moving as there is no air going through the radiator to keep the engine cool......hope this helps......cheers.

Jul 21, 2011 | 1999 Mazda Protege

1 Answer

2003 Mazda Protege5. Cooling fan on radiator is not running. This is the main fan on the left side of the radiator.


First, check the relay for the cooling fans. Not sure about Mazdas but Fords have two coolant temperature sensors. One for the gauge or light on the dash and one for the fan relay. Check and make sure the sensor hasn't went bad or come unplugged. If these don't fix it the fan itself may be bad.

Jul 11, 2009 | 2003 Mazda Protege

1 Answer

Cooling fan wont come on at temp


This vehicle has a radiator fan switch, it completes the circuit when the water temp get up to N.O.T normal operating temperature and turn the fans on, try changing radiator fan switch. Good luck and thanks for using FIX YA

Mar 03, 2009 | 1992 Mazda Protege

3 Answers

2001 Mazda Protege cooling fan or thermostat


I am realizing that the cooling fan in this car is very important. It has two in case you didn't notice. The driver side fan motor is bad in mine and the only result is poor air conditioner performance in stop and go traffic. It's fine at high speeds. I would think the thermostat is likely the culprit in your case, but if the fans are not working at all, you should get those replaced. The motors may be bad in both, which could definitely cause overheating. I've been researching prices and you should be able to get the parts for less than $100 each and installation is just a couple of bolts on each assembly.

Oct 18, 2008 | 2001 Mazda Protege

1 Answer

Radiator Fans


You may have air trapped in the cooling system, this causes a hot spot and the fans run, This is a common issue on most front wheel cars, jack the front of the car up as high as you can, fill the coolant reservoir full, run the engine until hot,( don't overheat it) then shut down, let the engine cool, this should self bleed the air, refill the coolant bottle and retest for your problem, restore the wiring, the not running fan is for AC. Spray cold water from a hose on the radiator his will help get the air out after the shut down.

Oct 15, 2008 | 1998 Mazda Protege

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