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Jacobandnickolas

Tiny
ILFFER2003
  • MEMBER
  • 2001 MITSUBISHI GALANT
Hello Jacobandnickolas
i trying to answer :
http://www.2carpros.com/questions/2001-mitsubishi-galant-overheating
with no luck , here is my answer , waiting your reply
so what i should do ?
please note i changed the fans and the fan contoler
another thing when i remove the coolant sensor plug i getting check engine light on the dashboard and the high speed come so i think this can tell me i have no issue with Fans , contoler and relay
and as with AC they working fine this give me an extra point to tell me the fans and controler are ok and the AC relay as well
yes as you say i tested the voltage and i got aroung 6 volt power so were exactly my issue ? where i can find this resistance and how i can replace
appreciate your help and many thanks in advance
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Saturday, November 5th, 2011 AT 8:18 AM

31 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,133 POSTS
First, I'm sorry I didn't get back to you sooner. I never received your reply. Another tech sent it to me.

As far as the issue, have you replaced the temp sensor? To be honest, the check engine light should come on and the system goes into a closed loop. Basically, the fan should kick on.

At this point, if the sensor has been replaced, my next check would be the ECM. It is what sends power to the fans via the electrical system.
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Monday, November 7th, 2011 AT 4:26 AM
Tiny
ILFFER2003
  • MEMBER
  • 28 POSTS
Hi
yes I have replaced it, 2 times I replaced it with the same issue :(
as my tech here he told me the reached power to fans is 6v
i dont know how the fans are working but if I have a bad relay or fuse the fans will not work at all or maybe work on low speed
to be honest I replaced the relay but I didnt replace the fues (50amp)
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Monday, November 7th, 2011 AT 6:07 AM
Tiny
ILFFER2003
  • MEMBER
  • 28 POSTS
Hi
i dont know why I cant see my reply, maybe you have issue with the site
anyway yes I replaced the coolant sensor 2 times with no luck :(
do you think I have an issue with fan fuse ( 50 amp )
i dont know how fans working but if the high speed only working via the relay maybe I have fuse issue
but if all speeds working via this relay I dont think so I have an issue as they working file with low speed
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Monday, November 7th, 2011 AT 6:31 AM
Tiny
ILFFER2003
  • MEMBER
  • 28 POSTS
How I can test ECU
and when I remove the coolant sensor the fans working as expected so do you think I have an issue with ECU?
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Monday, November 7th, 2011 AT 1:05 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
The coolant temp sensor you replaced was it on the thermostat housing or somewhere else?If somewhere else where was it?Also what were the colors of the wires going to it?
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Monday, November 7th, 2011 AT 5:45 PM
Tiny
ILFFER2003
  • MEMBER
  • 28 POSTS
Yes this sensor beside thermostat and when I remove the plug of this sensor the fan high speed comes
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Monday, November 7th, 2011 AT 9:17 PM
Tiny
SATURNTECH9
  • MECHANIC
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So the gauge shows the temp over heating but the fan never actually reaches high speed?What we really need to do is get a scanner that shows live data and we can watch what the ecm reads for temperture. That way we can see whats going on with the ecm etc. Also how did you test the wires and conector to the coolant temp sensor?
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Monday, November 7th, 2011 AT 9:29 PM
Tiny
ILFFER2003
  • MEMBER
  • 28 POSTS
From where I can do this scaning?
To be honest I didnt test the wire, I just replace the relay as I cave one relay for fans and another relay for AC and fuse for fans and I was planing to change this fuse - it seems will be useless -
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Monday, November 7th, 2011 AT 9:36 PM
Tiny
SATURNTECH9
  • MECHANIC
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The scaning would be from the obd2 connector on the drivers side where you hook it up for codes. You would need a scan tool that read live engine data to see the coolant temp. Jacobandnicolas told me you checked the wiring and connector what are the colors to the connector?
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Tuesday, November 8th, 2011 AT 6:52 PM
Tiny
ILFFER2003
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  • 28 POSTS
Ok but the fisrt thing I think testing wire will not add any value to me as when I turn on the AC everything is ok and if I remove the sensor plug fans working fine as well this give us a hint say you dont have any issue with the wires
what do you think
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Tuesday, November 8th, 2011 AT 7:50 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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What you are saying makes sense. Other than a wiring issue, it leads me back to the ecm.
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Tuesday, November 8th, 2011 AT 8:30 PM
Tiny
SATURNTECH9
  • MECHANIC
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Alright when you unhook the coolant temp sensor that puts the ecm in default mode which would run the fan on high speed. But that also proves the ecm knows to go to default mode and that the high speed driver for the fan in the ecm works. Also you said the fan comes on at low speed as well?If thats true then we know the ecm knows to do that and the low speed driver in the ecm works also as well as the relays and fans. That is why I was asking about getting a scan tool that reads live data to see how the ecm reads and interputs the actual coolant temp. Also a temp gun would help to compare the actual temp verus what the ecm is actually reading. Are you postive you got the correct temp sensor from the parts store because thats another possibility.
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Tuesday, November 8th, 2011 AT 8:49 PM
Tiny
ILFFER2003
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  • 28 POSTS
So now we can say the ECM working 100? Is there any possibility to have a bad IC on the ECM board causing this issue?
To be honest regarding to coolant sensor In the first time I bring a used one and it wasn’t work and they told me no this is crazy you cant use a used part so I bring a new one from Mitsubishi branch here
We had a doubt as my car designed for Arab gulf area maybe it need parts designed for this area as well and I ordered one from there, with no luck
The most important question : is there any another sensor control the fan speed, as I changed the coolant sensor and it seems my car computer working fine and the fans controller and it seems also the wire is ok, so maybe there is another sensor should tell the computer yes I have reached a high Temp. ( And this have not done )
?/
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Tuesday, November 8th, 2011 AT 9:24 PM
Tiny
SATURNTECH9
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Iam not saying you computer is for sure not a problem as far as the fan turning it on different speeds and temps. Your coolant temp sensor tells the computer what temp it is and from that temp the computer decides to run low or high speed based on temp. Thats why I said a infared temp with a scan tool. That can read live data will tell us what the computer sees compared to actual coolant temp. Also we can see if its just not seeing the correct temp to run high speed fan or its just not turning it on. Then we can see if its sending out the relay turn on for high speed when it should or not. Otherwise we can only guess and wonder as to why its not working. Also the low speed will come on while it runs and warms up correct?
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Tuesday, November 8th, 2011 AT 9:56 PM
Tiny
ILFFER2003
  • MEMBER
  • 28 POSTS
. Also the low speed will come on while it runs and warms up correct?

Yes correct

i will see who know about this scan tool
as the Mitsubishi here dont know anything, when I went to them they told me you have to change the engine !
They didnt see the car fans are working on low speed
i dont know how I can send a complain to Japan :(
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Tuesday, November 8th, 2011 AT 10:18 PM
Tiny
SATURNTECH9
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Alright iam wrong how the fans operate you actually have three speeds low medium and high and its based on vehicle speed coolant temperture and a/c operation request on which speed it will run. So lets get back to what is actually wrong with your car or fan?Does the engine overheat?
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Tuesday, November 8th, 2011 AT 10:27 PM
Tiny
ILFFER2003
  • MEMBER
  • 28 POSTS
Yes it is
and when it overheating you can open raditor cap without any risk, you will not burned by the coolant, and they told me this means you done have any issue with engine, correct?
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Tuesday, November 8th, 2011 AT 10:43 PM
Tiny
ILFFER2003
  • MEMBER
  • 28 POSTS
Yes engine is over heating and you can safley remove the raditor cap as coolant water will not burn you and as Tech. Man he told me this can tell us you dont have any issue in the engine
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Wednesday, November 9th, 2011 AT 10:17 AM
Tiny
SATURNTECH9
  • MECHANIC
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Are both upper and lower radiator hoses getting really hot?If not I would replace the thermostat.
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Wednesday, November 9th, 2011 AT 8:03 PM
Tiny
ILFFER2003
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  • 28 POSTS
I already replaced the thermostat
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Thursday, November 10th, 2011 AT 8:05 AM

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