A/C Compressor not turning on!!! Fault codes??
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A/C Compressor not turning on!!! Fault codes??
I have a 95 850 Turbo, with the electronic dual climate controls. Everything works fine, except all of the sudden now when I flip the A/C switch nothing happens at all. I tried tapping on the compressor with a long rod but no luck. I can spin the wheel with some force while the engine is running but the compressor is still not kicking on.
I dont know if I need a whole new compressor because the A/C was working real well before. I did change all of the bulbs in the intrument cluster and climate controls, and it seems since then the A/C has not worked, but I really dont know what I would have messed with to mess up the A/C.
Also I am getting these fault codes which make no sense: 1-4-5 Faulty signal from function selector switch, 4-1-1 Blower fan seized or drawing excessive current, 4-1-7 Passenger's side interior temperture inlet fan seized. From my knowledge everything else is working fine except the compressor not turning on.
I read there is a A/C relay and power stage located I believe behind the glovebox but I did not check this out b/c I am not sure what it looks like. If anyone can figure this one out and will be very impressed!!!
I dont know if I need a whole new compressor because the A/C was working real well before. I did change all of the bulbs in the intrument cluster and climate controls, and it seems since then the A/C has not worked, but I really dont know what I would have messed with to mess up the A/C.
Also I am getting these fault codes which make no sense: 1-4-5 Faulty signal from function selector switch, 4-1-1 Blower fan seized or drawing excessive current, 4-1-7 Passenger's side interior temperture inlet fan seized. From my knowledge everything else is working fine except the compressor not turning on.
I read there is a A/C relay and power stage located I believe behind the glovebox but I did not check this out b/c I am not sure what it looks like. If anyone can figure this one out and will be very impressed!!!
Super Moderator
Joined: Jan 2006
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From: SW, WA
RE: A/C Compressor not turning on!!! Fault codes??
Check the refrigerant charge level. LOw refrigerant/pressure will stop the compressor from turning on. However. with the codes you mentioed (especially 1-4-5) it sounds like you may have a switch/wiring issue. Do the lights on the climate control panel blink at all?
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RE: A/C Compressor not turning on!!! Fault codes??
No, the lights don't blink at all. Both switch lights work when you turn then on (or A/C off), but no blinking to indicate a problem with the system.
Yea the fault codes really confuse me because it seems like those systems are working fine. I'll check the refrigerant level, but I know the last time I had the A/C on it was real cold.
Yea the fault codes really confuse me because it seems like those systems are working fine. I'll check the refrigerant level, but I know the last time I had the A/C on it was real cold.
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Joined: Jul 2006
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From: Near Ararat, Victoria, Australia
RE: A/C Compressor not turning on!!! Fault codes??
ORIGINAL: Fisch12
I have a 95 850 Turbo, with the electronic dual climate controls. Everything works fine, except all of the sudden now when I flip the A/C switch nothing happens at all. I tried tapping on the compressor with a long rod but no luck. I can spin the wheel with some force while the engine is running but the compressor is still not kicking on.
I dont know if I need a whole new compressor because the A/C was working real well before. I did change all of the bulbs in the intrument cluster and climate controls, and it seems since then the A/C has not worked, but I really dont know what I would have messed with to mess up the A/C.
Also I am getting these fault codes which make no sense: 1-4-5 Faulty signal from function selector switch, 4-1-1 Blower fan seized or drawing excessive current, 4-1-7 Passenger's side interior temperture inlet fan seized. From my knowledge everything else is working fine except the compressor not turning on.
I read there is a A/C relay and power stage located I believe behind the glovebox but I did not check this out b/c I am not sure what it looks like. If anyone can figure this one out and will be very impressed!!!
I have a 95 850 Turbo, with the electronic dual climate controls. Everything works fine, except all of the sudden now when I flip the A/C switch nothing happens at all. I tried tapping on the compressor with a long rod but no luck. I can spin the wheel with some force while the engine is running but the compressor is still not kicking on.
I dont know if I need a whole new compressor because the A/C was working real well before. I did change all of the bulbs in the intrument cluster and climate controls, and it seems since then the A/C has not worked, but I really dont know what I would have messed with to mess up the A/C.
Also I am getting these fault codes which make no sense: 1-4-5 Faulty signal from function selector switch, 4-1-1 Blower fan seized or drawing excessive current, 4-1-7 Passenger's side interior temperture inlet fan seized. From my knowledge everything else is working fine except the compressor not turning on.
I read there is a A/C relay and power stage located I believe behind the glovebox but I did not check this out b/c I am not sure what it looks like. If anyone can figure this one out and will be very impressed!!!
1. A/C relay - located at rear of glove box (activated via A/C switch or ECC).
2. Pressostat - located on refrigerant pipe on middle of firewall (contacts open if refrigereant pressure drops too low).
3. High pressor sensor - located on refrigerant line adjacent to receiver/drier (contacts open if refrigerant pressure gets too high).
Pull apart the connector at the compressor and insert a 12v test lamp between the female part of this connector and the battery earth. If the circuit is continuous then this lamp should illuminate. It the lamp doesn't illuminate then it becomes just a simple matter of checking which of these three items isn't operating correctly (by shorting out the relevant contacts etc.)
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RE: A/C Compressor not turning on!!! Fault codes??
Well I checked the refrigerant level with a gauge and it seems to be at 0 psi. The only thing is can the pressure be checked that accurately with the compressor not working, also if I add refrigerant will the system charge with the compressor not cycling?
I am having trouble checking if current is going to the compressor. I think I have a case of the stupids, I can't find the electrical connector. I see the temp sensor but not sure about the electrical connection. Does anyone have a pic, or knows what it looks like so I can hook up my test light.
I am also having trouble clearing the codes. My book says to push the button for 5 seconds, release, the led blinks 3 times, then hold the button for another 5 seconds. Then code 1-1-1 shows up. But whenever I hold the button down for 5 seconds, afterwards nothing happens. Is there another procedure or could I unhook the battery and will that clear the codes?
I am having trouble checking if current is going to the compressor. I think I have a case of the stupids, I can't find the electrical connector. I see the temp sensor but not sure about the electrical connection. Does anyone have a pic, or knows what it looks like so I can hook up my test light.
I am also having trouble clearing the codes. My book says to push the button for 5 seconds, release, the led blinks 3 times, then hold the button for another 5 seconds. Then code 1-1-1 shows up. But whenever I hold the button down for 5 seconds, afterwards nothing happens. Is there another procedure or could I unhook the battery and will that clear the codes?
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Joined: Jul 2006
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From: Near Ararat, Victoria, Australia
RE: A/C Compressor not turning on!!! Fault codes??
ORIGINAL: Fisch12
I am having trouble checking if current is going to the compressor. I think I have a case of the stupids, I can't find the electrical connector. I see the temp sensor but not sure about the electrical connection. Does anyone have a pic, or knows what it looks like so I can hook up my test light.
I am having trouble checking if current is going to the compressor. I think I have a case of the stupids, I can't find the electrical connector. I see the temp sensor but not sure about the electrical connection. Does anyone have a pic, or knows what it looks like so I can hook up my test light.
There is an electical connector clipped to the front of the compressor. This is the wire that supplies the compressor solenoid clutch and can be pulled apart for testing purposes.
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Joined: Apr 2008
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From: Central Massachusetts
RE: A/C Compressor not turning on!!! Fault codes??
If you have 0 pressure in the refridgerant lines, the low pressure switch on the line senses this and shuts off power to the electric clutch whichengages the compressor. It won't let it run without refridgerant because the pump will burn up. The first thing you should do is recharge the unit, that would be cheap and easy. The refridgerant will fill the lines until itreachs the pressure level which activates the low pressure switch, then you will hear the clutch engage the compressor, The pressure will drop and the clutch will stop, then the pressure will build and the clutch will engage again....this cycle will repeat it self many times until the lines are full. You can pick upi a fill kit a Walmart for cheap, get the one with the pressure gauge on it and it may take about three cans of refridgerant.
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RE: A/C Compressor not turning on!!! Fault codes??
Hey thanks for the info guys. I still have the pressure gauge and kit I used to top the system off last summer so all I have to do is get some cans of refrigerant. I guess I will get 3 cans since the system seems to be completely empty. I'll let you guys know I make out.
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RE: A/C Compressor not turning on!!! Fault codes??
Well I added about 32 oz. of freon to the system, as soon as I started adding it the compressor turned on so you guys were right on that one!!! I was worried at first because when I started adding the freon the pressure went way up like the system was overloaded with freon. But as soon as the compressor went on the pressure started going down until about 5 psi, then after adding the two cans it leveled off at 35 psi. I emptied the two cans I got, I think maybe it could take another small can but the psi was at 35 so I didnt want to push it. Do any of you guys know what is the right psi for the A/C system?
I figured out how to clear the codes. Still not sure why exactly those codes came up but I am hoping it was all related to the compressor not turning on. I guess I will recheck the pressure in the system and see if any codes come up in a week or so. Thanks for the help guys!
I figured out how to clear the codes. Still not sure why exactly those codes came up but I am hoping it was all related to the compressor not turning on. I guess I will recheck the pressure in the system and see if any codes come up in a week or so. Thanks for the help guys!
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Joined: Sep 2006
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From: IPS, MA
RE: A/C Compressor not turning on!!! Fault codes??
If the code is 1-1-1, you can't clear it because that is system-normal.
Your evaporator may be on its way to retirement, allowing leak. If the system cannot hold pressure for a few days, there is a leak. The evaporator is known to go bad on the 850s.
R134a capacity: 26.4 oz. + PAG oil 6.8 oz.
System pressure: 25-33PSI on the low side.
See attached for future reference.
JPN
[IMG]local://upfiles/6892/1801F16677BF4D6284C67896259D3616.jpg[/IMG]
[IMG]local://upfiles/6892/A7A2AC070ABD43499D401E98CEC100CF.jpg[/IMG]
[IMG]local://upfiles/6892/20D606D15DF24D52A7F0E15B9AC01654.jpg[/IMG]
[IMG]local://upfiles/6892/122043FDD0064272B59E13447E2628F7.jpg[/IMG]
Your evaporator may be on its way to retirement, allowing leak. If the system cannot hold pressure for a few days, there is a leak. The evaporator is known to go bad on the 850s.
R134a capacity: 26.4 oz. + PAG oil 6.8 oz.
System pressure: 25-33PSI on the low side.
See attached for future reference.
JPN
[IMG]local://upfiles/6892/1801F16677BF4D6284C67896259D3616.jpg[/IMG]
[IMG]local://upfiles/6892/A7A2AC070ABD43499D401E98CEC100CF.jpg[/IMG]
[IMG]local://upfiles/6892/20D606D15DF24D52A7F0E15B9AC01654.jpg[/IMG]
[IMG]local://upfiles/6892/122043FDD0064272B59E13447E2628F7.jpg[/IMG]
Senior Member
Joined: Sep 2006
Posts: 5,340
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From: IPS, MA
RE: A/C Compressor not turning on!!! Fault codes??
Continued.
JPN
[IMG]local://upfiles/6892/F64FF78D00F442A797C4F4F14DF285E8.jpg[/IMG]
[IMG]local://upfiles/6892/FEB01F0DA79F48A0B84E9330AE62EBE8.jpg[/IMG]
JPN
[IMG]local://upfiles/6892/F64FF78D00F442A797C4F4F14DF285E8.jpg[/IMG]
[IMG]local://upfiles/6892/FEB01F0DA79F48A0B84E9330AE62EBE8.jpg[/IMG]
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