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Cooling fans not working

Tiny
THO-MOH
  • MEMBER
  • 1999 MITSUBISHI PAJERO
  • 1.8L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 143,000 MILES
However, when I disconnect the temperature sensor, fans turn the engine sign is displayed. I checked the temperature sensor as the temperature of the coolant increases the resistance decreases, also check a relay switch, and fans they are fine. So what could be the problem? Please help
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Sunday, September 8th, 2019 AT 10:46 AM

11 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Welcome to 2CarPros.

I have to tell you that this car isn't offered in the US, so my technical information is extremely limited. However, you did the test where checking resistance based on temp. However, do you have a chart indicating what the resistance should be based on temp? It may be reacting, but not reacting correctly.

https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor

Let me know.
Joe
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Monday, September 9th, 2019 AT 6:16 PM
Tiny
FLWESANYA
  • MEMBER
  • 4 POSTS
  • 1999 MITSUBISHI PAJERO
  • 100,000 MILES
1999 Mitsubish Pajero IO GDI(H76W-0032372: My car is overheating. I changed the thermostat. But it still overheats. It ruptured the radiator cover and I had to replace with a new radiator after failing to get the spare part separate. After putting the new radiator I noticed that the fan takes long to come on. And when the fan comes on it runs at a very slow speed for a few seconds and stops before the coolant cools. Now Is it the fan mortor that is failing or what is causing this? If I remove the thermostat from the socket the fan runs at normal speed but the car idling does not stabilise and the engine light in the dash board goes on. Kindly assist me with an answer.
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Monday, July 27th, 2020 AT 12:07 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Scan the computer for codes/s-start here -let us know-could be the coolant temperature sensor acting up-
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Monday, July 27th, 2020 AT 12:07 PM (Merged)
Tiny
FLWESANYA
  • MEMBER
  • 4 POSTS
I have done the scan: 'Fun control unit needs replacement'. That is all I was told.
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Monday, July 27th, 2020 AT 12:07 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
I don't have specific specs on that car but most all of these fans are intentionally designed to come on at higher temps for emissions reasons. Most don't come on until225 of higher and that is normal. As long as the fan is shutting back off, I doubt it has a problem at all.
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Monday, July 27th, 2020 AT 12:07 PM (Merged)
Tiny
FLWESANYA
  • MEMBER
  • 4 POSTS
Thanks. Now I am getting confused. What controls the speed of the fun? Because I see that when the fun is eventually started it moves at a very slow speed for a few seconds and then it stops. This causes engine overheating.
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Monday, July 27th, 2020 AT 12:07 PM (Merged)
Tiny
SALIZ
  • MEMBER
  • 1 POST
  • 1998 MITSUBISHI PAJERO
  • 2.0L
  • 4 CYL
  • 4WD
  • MANUAL
  • 50,000 MILES
The radiator fan is not working. The fuse is fine
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Monday, July 27th, 2020 AT 12:07 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
As I stated, I don't have a wiring diagram for that car but many have 2 speed systems. It could also be a bad fan motor but you could determine if that's the case by observing how it works with the A/C
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Monday, July 27th, 2020 AT 12:07 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Run power directly to the fan motor to make sure it is good. If it is, check the fan relay. Switch it with another relay that has the same part number. If that still doesn't work, check the coolant temp sensor.
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Monday, July 27th, 2020 AT 12:07 PM (Merged)
Tiny
FLWESANYA
  • MEMBER
  • 4 POSTS
Ok let me tray and observe. I will come back to you later.
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Monday, July 27th, 2020 AT 12:07 PM (Merged)
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
No code reader or scan tool would tell you what component needs to be replaced. They only tell you that a certain circuit has a fault.

What is the EXACT trouble code that you are getting?
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Monday, July 27th, 2020 AT 12:07 PM (Merged)

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