Question about 2003 Mazda MPV

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Cooling fans not working

The cooling fans quit working. I replaced the Module, temp sensor, and now the relay. I really do not know what else to do other than replace the fans but I had that done last summer.

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  • 36 Answers

Connect them directly to see if the run if so trace back from there

Posted on Jul 10, 2013

Testimonial: "I am not sure how to do that...I am very new to working on cars after I spend $1,500 last year to get this fixed. So could you give me a little more detail as to how I would be able to do that. Thank you so much for your help."

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Posted on Jan 02, 2017

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  • 740 Answers

SOURCE: 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

Posted on Mar 03, 2009

  • 10 Answers

SOURCE: MY 1989 mazda 323 cooling fan is not working.

motors probally burnt out

Posted on Apr 10, 2009

  • 4793 Answers

SOURCE: cooling problem with 1987 mazda b-2000.

try undoing the highest hose clip to vent any trapped air,could be this simple, if not get back.....

Posted on Jul 30, 2010

jturcotte
  • 8836 Answers

SOURCE: engine cooling fan run all the time when car is

Hi, the relay is turned on by the PCM based on data from the coolant temperature sensor. Disconnecting the sensor sends the computer into safe mode so it keeps the fan on. Check the sensor wire continuity to the PCM. If good, try replacing the sensor. Please let me know if you have more questions.
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Posted on Dec 31, 2010

markmayes66
  • 786 Answers

SOURCE: 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

Posted on Aug 17, 2012

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1 Answer

I have a 2005 uplander, the fans operate periodically when they should not. Have changed one senser.


How do you know when the fans should or should not work ? The PCM - engine control module tells the fans when to work . A coolant temp. sensor inputs coolant temp info to the PCM . Fans can come on when the vehicle isn't running , depending on temp. The cooling fans are turned on by the PCM using three relays . You best bet would be to take your vehicle to a qualified repair shop . Relay Driven Dual Cooling Fan Diagnostics

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look at temp control switch that turns fans on its a sensor mounted on motor or close to fans

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the main problem with that car is corroded wiring first thing to check is the wiring behind the front bumper liner and the wiring to the fan module take off the front bumper under liner easy to get to the connectors there is 2 connectors and a small harness to the engine bay fusebox

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Engine coolant fan wont come on. The fan motor is fine. whats next?


You still have many other components in that system that has to be in working order for the cooling fan to work properly. The cooling fan is turned on when engine temp reaches a predetermined temp, usually around 220-230 degrees F. the ECT (engine coolant temp) sensor siganls the ECM (Engine Control Module) to ground the cooling fan relay or cooling fan module(if equipped) and if the cooling fan fuse is good and the fan has power to it the realy will complete the ground for the fan to run. You may need to have a qualified technician diagnose the problem if the obvious things like fuses and good grounds are not the problem.

Hope this helps.

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2003 ford escape fans do not run in till the a/c is turned on.


There are four relays for the cooling fans .low speed control , medium speed , high speed fan control relay 2 , high speed fan control relay 1, there is also a engine cooling fan resistor .The engine coolant temp. sensor would most likely cause the check engine light to be on . There is also a dual pressure switch , this is for the A/C . The cooling fans will be turned on at 213 degress low speed , high speed at 226 degress . If you had factory scan tool or a professional type you could view coolant temp data in pcm , you could also energize the relays to see if the system is operating normally . There are other repair shops beside dealers

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Try checking the fuse box under the hood. It should have a fuse marked cooling fan or cooling system. If the car does start, that means the computer isn't out, but maybe there is a bad relay by the fan or in the circuit or even the temp sensor may be bad. The fan won't run until the temp is high enough; usually by the time the thermostat opens.

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1 Answer

06 vue cooling fan wont shut off tried new relay swich and the 40a fuse is obviously good. what could it be, temp sending unit?


The power for the fan comes from 2 relays in the
junction block on the left fender. One is a high fan relay 40amp the other is the low fan relay 20amp.
If either one is stuck, it will power the fan. Also if the
engine coolant temp(ect)sensor is bad, it can send a
false signal to the engine control module(ecm) and powering the fan. With the engine cool, if the fans still
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if the fan stops replace the sensor. If not pull the relays one at a time. And see which one stops the fan. If none of this works it may be an ecm problem.
Hope this helps.

Mar 21, 2010 | 2005 Saturn VUE

1 Answer

Cooling fan wont work


The water temp sensor is located near the thermostat housing. This sensor is what tells the ECM to turn the fan on/off. The water temp sending unit is located near the same area. You know you have the correct sensor is because the water temp sensor has a 2 prong plug. The water temp sending unit only has 1 prong.

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