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  #1  
Old 04-12-2010, 10:53 AM
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Join Date: Jun 2009
Posts: 41
Default AC Problems and the AC Clutch Relay

Alrighty,

I figured i would post this to help any others.
First off attached are two pictures, both are the ac clutch relay in my 96 audi a4 2.8.
In the first picture Number 267 is the relay.

My AC blows cold if i give the compressor direct power. However if i hit the ac button in the cabin, the snowflake will show up then quickly disappear.

I believe i may have a bad ac relay.
If there are any questions or suggestions hit me back. I've heard people mention not enough freon, but mine blows cold, nice and cold when direct power is given to the ac compressor.

Thanks guys.
Attached Thumbnails
AC Problems and the AC Clutch Relay-acclutchrelay2.jpg   AC Problems and the AC Clutch Relay-acclutchrelay1.jpg  
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  #2  
Old 04-12-2010, 01:56 PM
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Join Date: Apr 2007
Location: Minnesota
Posts: 1,161
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Maybe the A/C trianary pressure switch located on the condedesner. You should use a VAG on A/C and see what it says.
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  #3  
Old 04-12-2010, 02:27 PM
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The vag didn't throw any codes relating to the AC. We also used the temp control unit to throw codes and that didn't help either.
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  #4  
Old 04-12-2010, 02:35 PM
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I would try shorting together the pressure switch, Im not sure of the pinout though.
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  #5  
Old 06-21-2010, 01:51 PM
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anyone have a pic of the A/C "Trianary" switch located behind the passenger light?

Or does anyone know how to bypass it?
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  #6  
Old 06-22-2010, 10:58 AM
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The problem was my high side switch behind the passenger headlight was not connected.

So the people that diagnosed it as the Climate Control unit, created me another problem. Alas, all is good now Cold ac and a great working climate control unit.
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  #7  
Old 06-25-2010, 09:54 PM
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I am having the same problem, do you have a pic of the trinary switch?
I have replaced the relay but still no a/c, this heat is going to kill me!!
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  #8  
Old 06-28-2010, 07:47 AM
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you don't really need a pic of the trinary.
Just pull out your passenger headlight and its RIGHT there.
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  #9  
Old 06-28-2010, 12:07 PM
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Do you know if it is in the same place in a 1.8t as well?
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  #10  
Old 06-28-2010, 12:24 PM
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No clue. Sorry
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  #11  
Old 06-28-2010, 02:36 PM
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Ive got a 1.8 and thats where it is.
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  #12  
Old 08-25-2010, 12:07 PM
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Hi fellas, its my first post here
to start, i have also a problem but its the opposite
my clutch its always energized
its not the clutch stucked
i did troubleshoot by removing the belt and without power or with just contact-on the clutch is disengaged
but soon as a i start the car, it engages and pumps cold air... even whem im at full hot, making my requested full hot air still cold
myy bentleys says nothing about wich of the hundreds of relays installed is
my question is, which one is the clutch relay? (number)
i will also try checking on the trinary relay
your help is very much appreciated
thanks a million guys

my car is a 2001 A4-B5 1.8T AWM all wheel drive

yours:
Fernando. (Montreal Canada)
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  #13  
Old 08-25-2010, 12:29 PM
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ecs link to the clutch relay i bought:
http://www.ecstuning.com/Audi-B5_A4-...trical/ES1949/

I included numbers at the on page one of this thread.
Quote:
In the first picture Number 267 is the relay.

Last edited by mab9981; 08-25-2010 at 12:33 PM.
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  #14  
Old 08-26-2010, 12:00 PM
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267 thanks a million brother
i'll have a look and will keep you posted
Fernando.
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  #15  
Old 08-26-2010, 02:02 PM
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Ok Mab, here's what i got

1- first i did try the trinary switch, when disconnected the clutch did disengage and the fans shut-off

2- then i've found the clutch relay (as you said its 267 red)
- when disconnected, the clutch disengages but the fans keep running

i've meassured and the continuity between pins 85-86 is 69 ohm
so its not open (good), pins 30-87 are open until contact is closed, then resistance is 0 ohms
this means the clutch relay is good but
somebody is constantly sending 12v. to pin 85 closing the contact and therefore engaging the clutch
even at full hot, there's always 12v at that pin

next will be to meassure the pins at the trinary switch...
maybe it got stuck closed and ruining my hot air?

i hope i can find the schematic or wiring diagram

Thanks again Mab.
Fernando.
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  #16  
Old 08-29-2010, 01:53 PM
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Got a problem
cant find trinary switch anywhere
seems that ill have to go see the stealer (dealer)
Fern.
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  #17  
Old 08-30-2010, 01:12 PM
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Location: Minnesota
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rockauto.com has them for 80 bux. Search your car then select electrical switch & relay --> a/c trinary switch. Otherwise Napa has them for 110.
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  #18  
Old 08-30-2010, 01:20 PM
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I'm suprised no one has a pic of the trinary behind the headlight.

I might try to take some tonight if i can get around to it.

Hey Das Auto, i wouldn't be suprised if its not the climate control unit.
Mine had a weird problem like that, and that was the problem in the end.


Bought a used one from Shokan.com for 250 or so.

My clutch wouldn't stay engaged and the problem was the climate control unit not sending info right..
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  #19  
Old 09-02-2010, 07:39 AM
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Thanks guys
ill have a look at it
but before buyng it, id like to check it
if im not mistaken, it should close contacts both at high and low pressure, isnt it?
im trying to ident it on my bentleys electric diagram to see wich pins should have continuity
if you guys have a diagram at hand (a schema) it will be great ho see it and work with it.
thanks a million for your assistance

Fernando
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  #20  
Old 06-25-2012, 08:38 PM
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Posts: 1
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Where is this relay panel located? I have looked for an hour to find the location and I cannot find it anywhere. Any help would be appreciated. Thanks
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Old 06-25-2012, 08:38 PM
 
 
 
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Tags
18t, a4, ac, air, audi, clutch, compressor, conditioner, located, pics, picture, pictures, problem, relay, switch, trianary


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