Question about 2003 Mazda Protege

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Auxiliary fan not kicking on (it has 2 fans, the driver's side cooling fan and the passenger side fan that runs intermittently that comes on when a/c or when heat is set to defrost setting stopped com

My 03 Protege has 2 fans, the driver's side cooling fan and the passenger side fan that runs intermittently that comes on when a/c or when heat is set to defrost setting stopped coming on, it usually comes on for short bursts every 30 seconds but stopped working 2 days ago. Is this a problem? Its wintertime and I think its only for a/c use really to keep the engine cool, but wanted to make sure this won't cause problems with the engine or overheating. Thanks for any advice into this.

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  • Contributor
  • 9 Answers

It won't cause any overheating, that fan is only suppose to come on when the a/c is on. Since it's cold, it's not going to come on because the engine has at least 2 sensors that tell the temp and it can see it's not needed. Now, if you turn it on during the summer and it doesn't come on and your a/c doesn't work, you may have blown the relay or your a/c may be low/out.

Posted on Nov 28, 2013

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  • Eric Hulliberger
    Eric Hulliberger Nov 30, 2013

    xander82 - fan usually does come on when even cold when defrost or defrost/floor setting is selected and fan is turned on, but as long as I know its not a problem that makes me feel better. I would guess a relay has gone bad, or possibly even the motor itself, the fan still turns by hand, so its not froze up, but I'm not skilled enough to track down the relay or how wiring runs, I have no clue where the relay is anyway. I could replace the fan/motor assembly, but really don't want to in the winter outside. As far as the sensors, same deal. Guess I'll see whether the a/c runs or not come hot days, but that's a ways off here in Michigan. Either way, windows down is no big deal, car's 11 years old anyway, bought it new in late 2002, so really surprised the a/c even ran this long w/o a charge. Thanks to both of you for the input, much appreciated.

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You're right, that fan is for the a/c. It shouldn't cause a problem in the winter time, as long as you know the primary fan is working as intended.

Posted on Nov 28, 2013

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  • Eric Hulliberger
    Eric Hulliberger Nov 30, 2013

    Thanks monteham - the radiator fan is working. Took a while to get it to kick on in the cold, had to let it run forever, but it did come on luckily. Just won't use the a/c in the summer, but if I have to defog the windows due to humidity inside/outside of car and I kick on the defrost setting when temp is on cool, might be a problem, but usually you only have to run it for short bursts to clear inside fog, say when it is humid in the car, then a t-storm or cold front moves through and the air is drier outside, but inside car may still be moist.

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SOURCE: 2003 Protege 5 overheating on long runs.

I just replaced the radiator and thermostat on my 03. The radiator was defective (corroded) on the lip where the cap seals. This allowed coolant to be spat out. The thermostat was also sticking closed after new radiator and this caused overheating. Replace both while in there for under $100 if doing it yourself.

Posted on Mar 11, 2010

  • 12 Answers

SOURCE: the cooling fan does not go on and the temperature

after replacing all that its going to take the fan awhile to kick on but tis going to over heat fast with just water its got alot lower boweling point than coolant may be doing this faster than what the fan can kick on

Posted on Sep 18, 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

skychief2001
  • 21873 Answers

SOURCE: 1993 RX7 - cooling fan always comes on when engine is shut off.

I would want to know if the computer is grounding the fan relay to make it come on, or if the relay is faulty. On some models the computer turns the fan on to keep the radiator from overheating when the engine is stopped, but that should only happen with the engine at operating temp.

Posted on Sep 29, 2012

pcdj64
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SOURCE: 2004 mazda mpv engine racing and cooling fan not working

coolant temp sensor tells the computer how hot or cold the engine is so it can regulate the idle and fuel mixture, when it fails there usually is no cooling fan and you will have trouble starting the engine and keeping it running.

Posted on Oct 10, 2012

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