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Post by Benzev on Aug 19, 2005 22:43:29 GMT 11
I know the relay that supplies the power to my heater has bad contacts in it as it only works occasionally when I go over bumps etc. Once on it stays on until the next time I start the Bighorn again! I don't have a manual to find its location so was just wondering if anyone out there has had the same problem and has located it! Or maybe someone with a manual to be able to tell me where to find it!? Cheers guys!
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darkhunter
Isuzu Junior
isuzu trooper 2l upgraded to 2.6, injecting later,gonna be a beast soon
Posts: 105
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Post by darkhunter on Aug 20, 2005 17:59:20 GMT 11
what year bighorn,diesel or petrol and i take it you mean the heater fan unit?
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Post by Benzev on Aug 23, 2005 20:43:34 GMT 11
It's a 1990 Bighorn Irmscher S with a 4JB1-TC ;D!
And yes I did mean the heaterfan! Not the one under the passenger seat by the way as that works perfectly!
I know it has to be a relay as I have no power to the back of the switch or fanmotor and I do when it's gone over a bump and starts working! I know when I find the relay I can clean the contacts in it!! Still haven't located it though!
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Post by geeves on Aug 23, 2005 21:39:46 GMT 11
Most of the relays are in the fuse box but there are a couple over the other side of the engine bay. If you dont find it previously Ill have a closer look at mine on the weekend and let you know
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darkhunter
Isuzu Junior
isuzu trooper 2l upgraded to 2.6, injecting later,gonna be a beast soon
Posts: 105
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Post by darkhunter on Aug 24, 2005 5:38:56 GMT 11
check under dash,lefthand side of fan unit ,by shifter
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darkhunter
Isuzu Junior
isuzu trooper 2l upgraded to 2.6, injecting later,gonna be a beast soon
Posts: 105
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Post by darkhunter on Aug 28, 2005 0:37:55 GMT 11
also in engine bay relays should be a four pin relay with wires blue white,white,white red and black thats the power supply to heater fan,
under dash relay wires are blue red,blue green,green and black plus the resisters off the switch blue yellow,blue black,blue red,blue green,blue white wires but i suspect its the fan itself,turn key on and switch fan on and in the area of fan thump with your fist with good force but not so to break it ,had simular prob before and was fan sticking ,same syptoms as yours
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Post by Benzev on Aug 31, 2005 21:03:41 GMT 11
Cheers! I'll have to go and give it a thump later! I'll let you know if it worked! If so I'll be happy if it is that!
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Post by Benzev on Sept 2, 2005 23:36:17 GMT 11
I went to give it a thump then remembered that I'd already checked for power at the back of the switch and at the motor and there was none! So no amount of thumping would get it going anyway! I'll just have to trace the wires from the back of the switch to a relay and then I'll have the right one!(just more work though)
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Post by pig75 on Sept 3, 2005 8:02:06 GMT 11
It could also be the fan resistor block .usually located near the fan they use the air from the fan for cooling
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Post by trikimu on Apr 25, 2007 10:45:46 GMT 11
i have a similar problem on my 95 MU, but my fan doesnt go at all, i have tested all the fuses. when i turn the fan switich on i hear nothing and nothing happens. Does anyone know where the resistor pack on the MU is
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Post by pig75 on Apr 25, 2007 11:33:06 GMT 11
passenger side under the dash, straght behind the vent at the bottom of the glove box it has about 6 wires going into it undo the 2 screws and the block will come out
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Post by trikimu on Apr 27, 2007 15:29:24 GMT 11
ok i see to boxes in that location, one had exactly 6 wires but only one 10mm hex bolt holding it in place and it has denzo written on it the other had about 8 wires and has a brass looking back plate that screws it to the boddy, i took that on off but no resistors in it just a printed circuit board with a few IC's on it, so im guessing its the other on rite next to it?
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gecko
Isuzu Junior
Posts: 92
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Post by gecko on Jun 17, 2007 15:59:19 GMT 11
im having a simular problem in my 94 mu, my heater blower stoped working, after reading these fourms i pulled the blower apart and found it was sezied so i cleaned it up, greased it and it works fine (have tested the blower on a 12V source) but it still doesnt work when pluged in my mu i have checked all the fuzes in the cabin and motor bay, and there all fine, there is power comming into one side of the blower motor, i get 12V with the blue/white wire back to the body, but there doesnt seem to be a circuit between the blue/white and the blue/black. can anyone help, or know of anything that might? here are some pics (1 to 3) of relays or resistor packs, number 1 seems to be to do with the central locking as it doesnt work when its unpluged.  this is the inside of number 2, note there is some corrosion on the terminals and on some of the circuitry  |
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Post by dazza85 on Jun 17, 2007 20:31:38 GMT 11
Hi Gecko,
The 1st one is very likely the central locking, it looks the same as the one in my Toyota, The second looks a lot like the main computer, the third one looks like a standard relay.
The resistor pack is comonly fitted so that the resistor side is inside the duct and the plug terminals on the outside.
Hope this helps.
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gecko
Isuzu Junior
Posts: 92
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Post by gecko on Jun 17, 2007 22:46:06 GMT 11
cheers, this might be it, it does make a connection to the blower fan, the only reason i didnt think it might have been it was i thought it was a sealed unit but i can put my hand through were the blower fan sits (fans currently in on the back seat) and feel the back of it (heres some pics of it)   moulded into the plastic female plug it says "do not repair" is this the resistor pack maybe? |
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gecko
Isuzu Junior
Posts: 92
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Post by gecko on Jun 17, 2007 23:21:16 GMT 11
i think i might have cracked this one, i felt abit adventurous so i pulled the black thing out, and pulled it apart, this is what it looks like:  one of the soldering points has broken away, proberly caused by the fan being sezied and no air to cool it down, i could solder it back on but someone went to alot of trouble to put the words "do not repair" on this unit, so i think il try and get a new one. i hope this is it, ive spent most of my weekend trying to find out what was wrong, the dash doesnt resemble a dash at the mo and i cant wait till its all back togeather. one observation i made was after removing this i noticed there was a huge pile of leaves in the white unit, that will be cleaned out, something you might want to add to your 10,000 K service check |
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Post by dazza85 on Jun 18, 2007 16:20:41 GMT 11
Thats it ... You have found it.
If it easy to get at I would remake the solder joint. nothing to lose really ... if it gets to o hot and fails again replace it. I believe that you are right in that it failed because of the fault with the fan.
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gecko
Isuzu Junior
Posts: 92
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Post by gecko on Jun 18, 2007 17:14:47 GMT 11
im pricing out a new/2nd hand one at the mo, it says do not repair, i know i could but a replacement is not going to set me back that much
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PeterSchurms
Isuzu Junior
Black 95' 3.1 MU Auto in Melbourne
Posts: 132
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Post by PeterSchurms on Nov 8, 2007 11:39:52 GMT 11
I just had this same problem, heater fan just stopped. It was a failed joint. Made the fix in 15mins. Great instructions. Cheers!
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Post by mighty trooper on Nov 17, 2007 6:54:16 GMT 11
just somethig else to throw in the equation the heater fan wont work unless the engine is running and the alternator is charging
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