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Old 04-29-09, 01:51 PM   #1 (permalink)
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Fan Control Unit?

i'm having problems with BOTH of my fans not turning on... AC on, AC off, normal operating temp, neither one of them turn on.... my car starts and warms up, and right about the time the cooling fan should turn on, i get a check engine light... unfortunately, i don't have an OBD1 tool... oh yeah and AC compressor clutch doesn't engage... pretty sure its linked to whatevers wrong....

I did the troubleshooting guide from the manual, testing continuity, and i traced it back to the FCU most likely being the problem... all relays, motors, wires are in working order... is that where most fan problems (not turning on, or never turning off, etc.) point to? this could be the culprit to my blown HG...

i used a jumper wire from the FCU blue/yellow wire to ground, and both fans turned on...

before i commit to this $160 part, are there any other sensors/harness/components i should check? if not, is there an aftermarket version for this? safe to get used?

thanx fellas!
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Old 04-30-09, 12:57 AM   #2 (permalink)
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i got a fan control unit if u need one pm me
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Old 04-30-09, 02:03 AM   #3 (permalink)
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With this issue it is comparable sure, that the FCU is ready.
Some years before I had the same at the car from colleague, after replacing FCU it was ok.
I had this issue two years before, only one time, I opened the FCU and found some cold soldering points.
I resoldered nearly every soldering on the electronic card, after that it was running ok, better talked mostly ok.
Just a few days before I replaced it, because I had one second hand for spare.
Now everything is perfect.
About the price for a new one:
What is the price at acuraoemparts?
From my home computer I cannot open their sites, because they block europe. Only from my office I can look there.
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Old 04-30-09, 12:36 PM   #4 (permalink)
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Quote:
Originally Posted by MichaelKA8 View Post
With this issue it is comparable sure, that the FCU is ready.
Some years before I had the same at the car from colleague, after replacing FCU it was ok.
I had this issue two years before, only one time, I opened the FCU and found some cold soldering points.
I resoldered nearly every soldering on the electronic card, after that it was running ok, better talked mostly ok.
Just a few days before I replaced it, because I had one second hand for spare.
Now everything is perfect.
About the price for a new one:
What is the price at acuraoemparts?
From my home computer I cannot open their sites, because they block europe. Only from my office I can look there.
yeah i checked acuraoemparts also... came out to $123 plus tax and shipping... so prob around 140, give or take...

i read your post before when i searched... i ran my continuity tester on the card, and it looks like all of them have some current.... but some stronger than others... so that's why i wasn't sure if it was the FCU... but everything else works, so based on the manual and symptoms, this looks like the culprit... so we'll see....

thanx for your input!
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Old 04-30-09, 01:57 PM   #5 (permalink)
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You can buy a used one for about 40 or have someone resolder it for you.
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Old 04-30-09, 03:40 PM   #6 (permalink)
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Quote:
Originally Posted by trs031 View Post
You can buy a used one for about 40 or have someone resolder it for you.
i'm not much of a computer chip guru... i tested continuity on all points, and it shows current thru all of them... except for two, but those aren't connecting to anything on the harness... its just an empty female connector, no wires going to it from the car... i tested from the bottom (solder points) and top thru resistors individually... all seem to work.. could there still be something wrong with my FCU? or could be something else?

i've been trying to look at the fan timer unit... but i have no clue how to take that carpet panel off on the side... i've been tugging, pushing this way, that way, that thing will not come off... is there a trick?

thanx..
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Old 04-30-09, 04:29 PM   #7 (permalink)
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With resoldering the cold solderpoints I could rescue my one for about two years. Just now I replaced it, with a second hand one, but it was not really neccessary, 95% it was working ok.
So, when you know soldering, or have somebody who can do it, it is a good chance to get it "alive" again.
Even when the issue is changing its face, it will be prove the diagnose.
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Old 04-30-09, 04:45 PM   #8 (permalink)
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Quote:
i've been trying to look at the fan timer unit... but i have no clue how to take that carpet panel off on the side... i've been tugging, pushing this way, that way, that thing will not come off... is there a trick?
Yes, little bit tricky.
Under your glovesbox is a plastic cover, this must be removed. The three small "screws" aren't screws, only clips. You must without pressure turn the "screws" out and then pull out the clips.
The plastic cover is now coming down, only hanging at two holders in front.
Then it is the best, you take the entrancebar, the plastic stripe, between the doorgasket and the carpet, away. You can open it, when you go with the fingers under it and pull. It is only tighten with snap-clips.
After that, you can raise the carpet from doorentrance going to the front. In the front it is only under one holder, not tightened.
So you can raise the carpet to the left, until you have enough room to remove the 4 screws of the protectionplate from the ecu.
Carefully not to pull the carpet until wreck.
And one advise:
When you first time handle the protectionplate, it is best to take gloves, the sheet is very sharp edged, some years before, I was cutting my finger deeply.
And it is very odd, to get blood to the bright carpet.
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Old 04-30-09, 04:50 PM   #9 (permalink)
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ok so that corner just snaps off... guess i just got man up and pull it off... hahahaha thanx dude!
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Old 04-30-09, 05:12 PM   #10 (permalink)
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oooohhhhhhhh ok... i didn't know that the metal solder is supposed to have conductivity... i just looked it up.. duh! so it can lose conductivity?

i thought it just held the wire in place...

yeah, all my joints are pretty bad then... hahahaha my cousin says he will try resoldering it... if that doesn't work i'll get a used one...

thanx!
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Old 04-30-09, 05:25 PM   #11 (permalink)
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Quote:
oooohhhhhhhh ok... i didn't know that the metal solder is supposed to have conductivity... i just looked it up.. duh! so it can lose conductivity?
Yes, indeed it can lose conductivity.
You can see this, when you know "cold solderpoints":
Normally, the solderpoint is a little bit looking like a volcan, with the leg of the electronic element in the middle, and the metal-flow of solder without any interruption.
When you see a circle, like a small ring around the leg, it is a very small crack in the soldering. There it is losing contact, or conductivity.
Good luck!
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Old 04-30-09, 06:04 PM   #12 (permalink)
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got it! thanx dude...
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