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Post by ronan on Jul 24, 2006 8:31:28 GMT -5
The fan in my 88 is just stuttering (clicking on & off) and with the hot temps that were seeing my gauge climbs when sitting in traffic. It drops back to normal while in motion. Can someone give me suggestions on where to start troubleshooting? Anyone encounter this problem in the past and what did you do to correct the problem. I was planning on running a temporary feed to the fan motor first to verify that it`s good. Anyone know where the coolant temp sensor is located under the hood? Is there a relay somewhere to actuate the fan and where would this be located ? Any suggestions would be greatly appreciated.
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Post by Scoobaru on Jul 31, 2006 8:17:24 GMT -5
I had a problem with my fan a few years back, it wasn't running at all, and the only time I saw a problem was sitting in traffic on a hot day. When in motion, all was fine, thanks to the small size of the block!! Problem was the thermoswitch for the fan, basically a switch that senses engine temperature and turns on the fan when required. THis is a separate circuit than the temperature guage. If memory serves me correct, the switch is on the rear of the block. I can double check that if you like. You can usually find a thermoswitch fairly cheap on Ebay, or you can try your local parts store, not sure if they would still stock it.
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Post by ronan on Jul 31, 2006 11:19:36 GMT -5
All right, I pulled the fan out and ran temporary wires to verify that it`s not the fan. It ran Ok. Next, I went to my shop manual to locate where the fan relay is. Problem is, my manual is for a 89 Justy and I ran into a snag. The electrical drawing identifies it as being in a row with others up under the dash? I unbolted my dash and pulled back for a look-see and found nothing? Anyone know if the 88 models have a relay and where it might be? I am assuming since my in dash temp gauge is working fine that it should be sending a signal to the ECU and in turn activating the relay??? I`m a novice on Auto electronics and could use some advice on which way to go too solve my delimma??? I`m about ready to throw in the towel and wire the fan in direct, but the car runs a little on the hesitant side until the temperature reaches normal. This will be a problem with the upcoming season change... Scoobaru, I will look for this thermoswitch and change it out also...
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Post by 92justy on Jul 31, 2006 18:59:45 GMT -5
Ronan, If you have more difficulties, I have access to factory spec and pictures I can send. Check my repository of Subie specs and electrical wiring diagrams at: www.answerswanted.com/justy/It seems the temp gauge is much separate from the components you're having troubles with... Dano
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Post by ronan on Aug 3, 2006 16:11:13 GMT -5
All right still banging my head with this. In my urgency I pulled the fan thermo-switch out while the engine was a little on the hot side draining the coolant. Took it to the parts store and they ordered one in for me the next morning. I installed the new one and filled with coolant to start. I turned the key and noticed that my temp gauge started climbing and pegged out before I turned the motor over??? Now I`m thinking that I might have cooked my temp sending unit??? I removed it and with my meter, took a ohm reading 2.06. Then I put it in the freezer and chilled it down and took another and it gave me a reading of .577. I`m assuming that its working??? With both thermo switch and temp switch unplugged and turning the key to start position but not cranking the gauge still pegs??? Then I plugged both in and no change. Where am I not looking to correct this problem??? I looked at your single lines but I`m a novice at understanding.
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Post by ronan on Aug 9, 2006 13:47:59 GMT -5
Found a instrument cluster from a U-pull it out of a 89. Everything looks the same. Replaced the temp sending unit and installed the instrument cluster. Turned the key to the start position and same results. So I started removing everything and unbolted the dash again. Looked at all the wiring from where it comes through the firewall out to everything and found nothing out of place or smoked. the grounds were tight. While everything was just hanging loose, I hooked up the cluster and turned the key again. GUESS WHAT??? Temp meter was normal. So I started the vehicle and let it run until the gauge got up to the half way mark and back to my original problem. The fan which is just laying on top of the battery/fender, right now is just blinking on and off. So I started gingerly reinstalling the dash and my temp gauge problem has not came back as of yet but I`m still dealing with the fan issue or problem #1. Anyone out there had this kind of frustrating misery before and a solution???
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Post by ronan on Aug 13, 2006 6:23:24 GMT -5
Got everything back together and checked the fuse to the fan again and found it to be blown this time. I replaced the fuse and drove the car for a couple of miles and then I lifted the hood and found that the fan was working like norm. I let it sit there and idle while the fan cycled on and off like normal and the temp gauge never rose above the 1/3 mark. GO FIGURE! 10 days of banging my head against the concrete driveway and still have`nt figured out what happened. But the car is up and running again until the next time.
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Post by vmf241 on Sept 24, 2006 9:55:47 GMT -5
Hi Ronan: RE Fan cycling: I hope at this point the prob. has solved itself. If not, I understand that some justys has a FAN RELAY, in addition, I has found that the SUBARU supplied electrical schematics are often vague, or in my case omitted this fact altogether. I would check the wires, esp. the connector, as the proximity to the battery and it's venting acid gases during charging tends to corrode this connector, I regularly clean mine and apply DIELECTRIC grease; this has kept the fan humming nicely, important as I live in the high desert of eastern Oregon. Fan assemblys are available, and cheap from Mac's Radiator & repair in CA, WA, ID and Oregon. Fans seldom fail. Let us know how you are progressing! Regards.
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Post by ronan on Sept 26, 2006 18:39:02 GMT -5
No more problems with the fan issue. THANXXX
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Post by codfizzle on Oct 27, 2007 11:40:41 GMT -5
Probably too little too late, but if there's any advice I can give, it's this: If you own an 88 justy, then go buy a repair manual for an 88, not an 89. You'd be suprised how many differences there may be between the two years (unless of course you have a repair manual which covers all models within a 5 year range instead of being year specific). You can get new Chilton's manuals on ebay for $5 - $10.
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Post by fraser9764 on Dec 19, 2007 12:46:24 GMT -5
jgilk1 turn caps lock off
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Post by ronan on Dec 19, 2007 13:35:04 GMT -5
WOW this brought back memorys of frustration. I still see the cracks in the concrete out in my driveway from banging my head after that fiasco...LMAO
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SeattleJusty
No, a boxer will not fit in a Justy.
Posts: 1,587
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Post by SeattleJusty on Dec 19, 2007 14:12:41 GMT -5
Ronan+everybody else: this is a perfect example of why it is important to exercise the K.I.S.S.-rule. Keep It Simple Silly. When something isn't right, it is usually the smallest (and least expensive) thing. Bad contacts and fuses are the first things to check. Ronan, I am so glad you figured it out, man:) I know the frustration has paid off in the satisfaction of having solved it and the knowledge about what to do when another problem arises in the future.
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Post by blacklight on Nov 16, 2012 14:37:54 GMT -5
Resurrecting this old thread. I have a "pulsing" cooling fan on my -89 Justy with a -88 (?) carbed engine in it. I've just today changed the thermostat and while I were servicing the carb earlier, I found 2 wires entering a "sugar cube" , joining together to a ground connection at the back of the engine, on the intake manifold. There is no fan-switch on the lower part of the radiator, and I can't seem to find one on the intake manifold neither, except for the one for the instrumentation. Help? //Magnus.
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Post by Armageddous on Nov 16, 2012 21:22:04 GMT -5
What do you mean by "pulsing"? As in it is trying to move but can't get there, or it is cycling?
There should be a fan switch on the intake manifold, I believe they are on the driver side near the coolant outlet. (Sorry have not seen a carb motor in a while). It is a single wire and receives the negative side of the radiator fan. The radiator fan is constantly supplied with power and the fan switch just grounds out when the trigger temperature is reached.
If I think I know what you're saying, someone has bypassed this switch to run the fan continuously? If this is true and your fan is "pulsing" it may be faulty and not able to pick up speed (likely due to worn out brushes).
I would remove the fan from the engine bay and bench test it.
Terry
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Post by blacklight on Nov 17, 2012 4:59:49 GMT -5
As in intermitent on off, seemingly regardless of temperature or any other conditions that I can think of. Edit: Found a pic of the vacuumlines from when I was fiddleing with the carburetor, and here you can see the "sugar cube" setup on the rear of the intake manifold. Pic: img594.imageshack.us/img594/8505/dsc00395so.jpgNono, sometimes it starts spinning after a few minutes of driving and then stays on, and sometimes it just goes on/off intermittently, like a turn signal relay, but only no real "beat", so to say. I can test the fan, yes. //Magnus.
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Post by Armageddous on Nov 18, 2012 1:46:38 GMT -5
Kinda sounds like a faulty fan switch, they can cut in and out like that if they're starting to fail. I still don't see your sugar cube, I must be blind. I see a ground on the intake manifold which is normal, it probably has 1 or more black or black/blue wires leading into it which is normal.
Usually but not always if the fan switch is starting to fail it will look weird on the out side, like it's starting to melt or something.
Terry
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Post by blacklight on Nov 18, 2012 5:57:27 GMT -5
Yeah, I figured. Can't really find it though. :/ Where is it located? I know what it normaly looks like, just need to know where to look. The sugar cube is the black thing between the vacuum lines, just below the cable shoe that grounds the 2 wires. I can go out and see what colors the wires from the haress have, to be able to backtrack what these to did before the retarded previous owner did this... //Magnus.
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Post by blacklight on Nov 21, 2012 9:14:48 GMT -5
The wires entering the harness is both black... Is this original? Feels fishy having 2 wires of the same color of that dimension to be grounded. Grounded for what? :S Anyway, I couldn't find a fan switch on the transmission-side of the intake manifold, just a thermometer unit with a black-white and a yellow-green wire coming from it. This leads me to belive that the fan is switched by the ECU through a relay. Can this be true?
//Magnus.
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