Hello all, long time lurker but first time poster. Got a question about my '95 850 GLT sedan. Seems like we're all finding issues with our A/C systems right now since we're probably turning them on for the first time in a while....and mine is no different. First off, I've got the dreaded a/c and recirc lights flashing on my ECC. I pulled the codes and I've got the usual driver and passenger temp sensors fan seized (easy fix with some compressed air) and a fault on the blower motor current (blower still works so I'll replace when it goes out completely as it's an intermittent error). Everything else seems to work fine, and I've got no more codes...but my A/C does not kick on when when I push the A/C button. By not kicking on I mean that the compressor does not start to cycle and I get no cooling effect in the vents. I had the compressor replaced last year and it worked like a charm all thru last summer...so I'm leaning toward something electrical...perhaps a relay? I removed the glovebox and I found what appeared to be a relay (a blue box looking thing) right behind it. This blue box actually clicks when I push the A/C button, so I'm guessing that means the box is working correctly. After that I am totally lost on what to look for next...all the fuses look good under the hood, anyone got any ideas? Thanks in advance for your help.
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Ecc A/c Issues, Need Your Thoughts
Started by bro_hof, Mar 16 2006 08:37 PM
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7 replies to this topic
#2
julian
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Posted 16 March 2006 - 09:43 PM
You can check if the compressor clutch is getting 12 volts. hook up some leads to the terminals and use a volt meter.
another reason the compressor won't turn on is if the refrigerant charge is low (or if the low pressure switch is bad/disconnected and telling the PCM that the charge is low).
another reason the compressor won't turn on is if the refrigerant charge is low (or if the low pressure switch is bad/disconnected and telling the PCM that the charge is low).
#3
merlin390
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Posted 16 March 2006 - 09:46 PM
my guess is the evap core has holes in it. why did you replace the AC compressor?
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Works in progress - Conversion to turbo with a NA motor or 260hp no turbo. Say a prayer for me.
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#4
bro_hof
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Posted 16 March 2006 - 10:25 PM
The AC compressor was replaced because it had locked up and would not turn any more. If I remember correctly they also changed the Evaporator as well since it is a requirement to do so when you open up the system.
Would it throw any codes if the low pressure switch was sensing the refrigerant is low and thus would not function?
Would it throw any codes if the low pressure switch was sensing the refrigerant is low and thus would not function?
Edited by bro_hof, 16 March 2006 - 10:21 PM.
#5 Guest_Guest_whilst_*_*
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Posted 17 March 2006 - 12:53 AM
QUOTE(bro_hof @ Mar 16 2006, 10:25 PM) 
The AC compressor was replaced because it had locked up and would not turn any more. If I remember correctly they also changed the Evaporator as well since it is a requirement to do so when you open up the system.
Would it throw any codes if the low pressure switch was sensing the refrigerant is low and thus would not function?
Would it throw any codes if the low pressure switch was sensing the refrigerant is low and thus would not function?
NO. It is not required to change evaporater. It is the "receiver/dryer" that is to be changed.
You haven't any/much refrigerant left.
No A/C.
#6
calgary850awd
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Posted 17 March 2006 - 12:22 PM
The reason your compressor most likely failed was due to no refridgerant in the system and that caused the compressor to sieze up. Like Julian mentioned if there is a low charge the compressor might not engage. So I would start looking for leaks. The evaporator is located behind the dash. The entire dash will need to be removed in order to replace it. Did the mechanic install any ultraviolet dye into the A/C system when he replaced your compressor. Most places do that when they recharge A/C systems so if there is a leak in the future they can use a ultraviolet light to help find them. I would start off by having the refridgerant level checked and go from there. If it is low there is a leak somewhere else. If the charge is good then you may very well have a electrical concern.
Good luck
Corey
Good luck
Corey
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1997 855 AWD 5 speed
#7
bro_hof
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Posted 17 March 2006 - 01:52 PM
Thanks for the help guys, Ill have to get it checked out I guess to see if the refrigerant is low.
#8 Guest_AlvinL_*
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Posted 17 March 2006 - 04:19 PM
QUOTE(bro_hof @ Mar 16 2006, 05:25 PM)
Would it throw any codes if the low pressure switch was sensing the refrigerant is low and thus would not function?
It won't throw any codes if it senses low pressure. However, you can do a quick test by jumping the low pressure switch connector and see if the compressor starts up. If it does, the refrigerant is low. Don't leave it running that way though. Only for test.
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