GalantVR4.org The Mitsubishi Galant VR-4 Forum
Galant VR-4 Forums » Galant VR-4 » Newbies » Radiator fan switch function?
Previous thread Next thread

Radiator fan switch function?


tektic
Senior Member


Galant VR-4 org Post #: 1247231 posted 09/17/19 04:01 PM     Remind Me!  Send Private Message   Edit Post      
I'm using a stock rad fan sensor... At least I think it is. First off what's the difference between the fan sensor and the ac sensor?

OK, so under normal operations cold its supposed to flow power and hot it breaks the circuit? Or opposite?

I'm trying to connect a relay to what I think is the fan sensor but it is acting very strange.

If this is the case I have to wire:
85 - ground
86 - signal
87a - fan
30 - fuse power

Is that correct?

No that would leave the power in when the key is off..
I'm stumped.



7 1G DSM's now a GGSX build.


Edited by tektic (09/17/19 04:24 PM)

Posts: 1464 | From: ronkonkoma, ny | Member Since: 12/19/12 | IP: (24.189.25.4) | Report this post to a Moderator

tektic
Senior Member


Galant VR-4 org Post #: 1247235 posted 09/18/19 03:19 AM     Remind Me!  Send Private Message   Edit Post      
That's not the case. Out of the 3 sensors I had two were bad and conducted power at room temp. So I'm going to swap to the third sensor... Fan should be wired to 87 not 87a

Posts: 1464 | From: ronkonkoma, ny | Member Since: 12/19/12 | IP: (24.189.25.4) | Report this post to a Moderator

tektic
Senior Member


Galant VR-4 org Post #: 1247346 posted 09/29/19 11:57 AM     Remind Me!  Send Private Message   Edit Post      
Nothing worked so far. I still don't get this... Can someone please explain this to me.


Edited by tektic (09/30/19 05:02 AM)

Posts: 1464 | From: ronkonkoma, ny | Member Since: 12/19/12 | IP: (24.189.25.4) | Report this post to a Moderator

transparentdsm
I have to say something dumb Member
138/2000


152/1000


Galant VR-4 org Post #: 1247356 posted 09/30/19 07:49 AM     Remind Me!  Send Private Message   Edit Post      
so on your sensor you need the sensor to complete a circuit to turn on the fan. so something would need to tell the relay to turn the fan on, something like a single post that would ground its self out once it hit a temp, the oem sensor is looking for you to complete a path, so i would run a ground wire to the sensor on 1 side from the relay and then off the sensor to the fan ground and make sure the fan is constantly getting power. or switch it around and go power instead of ground. that way when the sensor hits its temp it with complete the circuit, kick on the fan and operate as it should. and honestly i dont really see the need for a replay the way i would do it.



138/2000
152/1000

Posts: 3589 | From: Klamath Falls, Or | Member Since: 07/27/11 | IP: (71.89.204.234) | Report this post to a Moderator

transparentdsm
I have to say something dumb Member
138/2000


152/1000


Galant VR-4 org Post #: 1247358 posted 09/30/19 08:52 AM     Remind Me!  Send Private Message   Edit Post      
to run a relay you need it to be set up like this. and if you want two fans you add another fan and another relay and splice into the first relay for your signals(temp sensor and ignition key).



138/2000
152/1000


Edited by transparentdsm (09/30/19 08:54 AM)

Posts: 3589 | From: Klamath Falls, Or | Member Since: 07/27/11 | IP: (71.89.204.234) | Report this post to a Moderator

tektic
Senior Member


Galant VR-4 org Post #: 1247369 posted 09/30/19 12:52 PM     Remind Me!  Send Private Message   Edit Post      
Thank you. The factor sensor has two wires. I fed one side ignition power. Other side goes to the relay. Other side of relay is grounded.

The problem is the fan goes on as soon as I turn key to on. I though it was a bad sensor, but now I'm assuming its going to shut off when the sensor gets to temp.

I just noticed there's two different sensors with the same plug but different threads. I'm using the ones that fit in the thermostat housing. That's the ac fan switch?

What I really need to know is if that's a temp sensor or a thermal switch. If its a temp sensor its useless in this app. If it is a switch I should only need to swap the output to fan to pin 87a from 87 to reverse logic of the circuit.

I'm pretty sure this will turn the fan on when the sensor is unplugged, off when plugged in and cold, and on when hot.

Posts: 1464 | From: ronkonkoma, ny | Member Since: 12/19/12 | IP: (24.189.25.4) | Report this post to a Moderator

ktmrider
Cool Guy Crowd


Galant VR-4 org Post #: 1247378 posted 10/01/19 03:15 PM     Remind Me!  Send Private Message   Edit Post      
The one in the top of the thermo housing ( pointing to the hood/sky ) is a Normally Closed switch. Was for the factory AC, shut off power to the AC if the coolant was overheating.

One facing to the firewall is Normally Open. This is also for factory AC, turns on the second ( DS ) cooling fan when AC is engaged.

Primary radiator cooling fan sensor is in the bottom of the radiator. Normally Open type.



Mike O.
#464/1000 - Sold
05 Legacy GT - slush box
#86/2000 - Sold ( again )

Posts: 3115 | From: Portland, OR | Member Since: 09/10/07 | IP: (148.64.18.76) | Report this post to a Moderator

tektic
Senior Member


Galant VR-4 org Post #: 1247381 posted 10/01/19 05:40 PM     Remind Me!  Send Private Message   Edit Post   
Thank you!

So I have to repin the relay. However that's going to leave the fan on when the car is in acc not on position... This sucks.

I guess I'm going to have to find a 3/8 bspt sensor normally closed. Booo

Posts: 1464 | From: ronkonkoma, ny | Member Since: 12/19/12 | IP: (2607:fb90:7aa9:f) | Report this post to a Moderator


Pages: 1
Previous thread Next thread

Extra information
1 registered and 14 anonymous users are browsing this forum.

Galant VR4.org Moderator:  Hertz, curtis, steve, atc250r, jcgalntvr4-244, cheekychimp, jepherz, Rausch, toybreaker, iceman69510, pot, FlyingEagle 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled

Rating:
Thread views: 629

Rate this thread


News & Events: News | Events
Galant VR-4: Newbies | General VR4 Discussions | Technical Discussions | How To and Info Archive
Marketplace: Parts For Sale | Cars For Sale | Good Guys | Bad Guys
Community: Members' Showcase

Contact Us | Privacy statement GalantVR-4.org

Generated in 2.714 seconds in which 2.578 seconds were spent on a total of 14 queries. Turbo powered.


Hertz's Galant VR-4 Page