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PostPosted: Sat Jul 14, 2018 5:34 pm 
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Joined: Sat Jun 21, 2008 11:42 pm
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Year and Trim: '91 Olds 98 Regency Elite
'88 Bonneville
Working on a 2000 Bonneville today. AC Compressor not working. Checked fuse and Relay and found both to be fine. Used external power source and compressor kicked in and ran. Checked for power at the plug with volt meter and had proper voltage there when ac was turned on at dash. The static pressure on my manifold gauges would not equalize so I wondered if my orifice tube may be clogged, so I evacuated the system, pulled the orifice tube and found it completely clean..... So I vacuumed the system, and attempted to refill with proper charge of refrigerant....because the compressor will not work I cannot charge to proper level outside of about 10-12 ounces that are sucked in from the vacuum on the lines..... this one is making me scratch my head....could I have a bad compressor even though it kicked in and ran with my external power source?? BTW, the condenser fan is not coming on when AC is called for..............


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PostPosted: Sat Jul 14, 2018 5:56 pm 
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Joined: Tue Oct 19, 2010 7:45 am
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Location: New York
Year and Trim: 2004 Bonneville SE
Place the refrigerant can (upright) in a container filled with hot water.

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2004 Bonneville SE 151,xxx- 20% tint all around, 5% tint bar on windshield | 4500k DDM HID low | De-badged | Hardwired Passport 9500ix | FWI(inter-cooler piping) | FE2 Rear Sway Bar | Solid Motor Mount | 180* Stat | Firm Shift Kit

My old car(now brother's car) 1998 Bonneville SE 230,xxx- 20% tint all around
Other cars in family(only the Pontiacs)
- '92 Bonneville SE - '85 Grand Am - '73 Catalina - '67 Catalina
- '87 Bonneville SE - '82 6000 - '78 Catalina


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PostPosted: Sat Jul 14, 2018 6:04 pm 
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Year and Trim: '91 Olds 98 Regency Elite
'88 Bonneville
Tried that...but still can't get compressor to cut on.. I don't know if Compressor is bad, the pressure switch is bad, or the head unit is bad.....


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PostPosted: Sat Jul 14, 2018 6:59 pm 
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Year and Trim: 2004 Bonneville SE
To confirm you're only adding on the low side.

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2004 Bonneville SE 151,xxx- 20% tint all around, 5% tint bar on windshield | 4500k DDM HID low | De-badged | Hardwired Passport 9500ix | FWI(inter-cooler piping) | FE2 Rear Sway Bar | Solid Motor Mount | 180* Stat | Firm Shift Kit

My old car(now brother's car) 1998 Bonneville SE 230,xxx- 20% tint all around
Other cars in family(only the Pontiacs)
- '92 Bonneville SE - '85 Grand Am - '73 Catalina - '67 Catalina
- '87 Bonneville SE - '82 6000 - '78 Catalina


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PostPosted: Sat Jul 14, 2018 10:33 pm 
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Year and Trim: 2000 SE. 2000 SSEi, 2001 SSEi, 2002 SLE
You said you could force the compressor to run with direct voltage, so just do that to get the prropper charge and then replace the pressure switch cause that is most likely your problem. If not it is the cheapest place to start tossing parts


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PostPosted: Sun Jul 15, 2018 10:01 am 
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It may be better to scan live data. The lack of condenser fan leads me to believe that the computer is not even commanding the compressor on for some reason.

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PostPosted: Sun Jul 15, 2018 10:14 am 
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Year and Trim: 2000 SE. 2000 SSEi, 2001 SSEi, 2002 SLE
RJolly87 wrote:
It may be better to scan live data. The lack of condenser fan leads me to believe that the computer is not even commanding the compressor on for some reason.



I may be wrong and it wouldnt be the first time, but i think the fan is triggered by the compressor engaging and I think both are triggered by the pressure switch. I be it is the pressure switch failed


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PostPosted: Sun Jul 15, 2018 11:11 am 
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Do you have an stored codes? I had two high pressure switches go bad on me which left the AC system inoperative. Extremely easy to replace the sensor.

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PostPosted: Sun Jul 15, 2018 12:19 pm 
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Location: Las Cruces, NM
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1994 Buick Regal Custom
Goostoff wrote:
RJolly87 wrote:
It may be better to scan live data. The lack of condenser fan leads me to believe that the computer is not even commanding the compressor on for some reason.



I may be wrong and it wouldnt be the first time, but i think the fan is triggered by the compressor engaging and I think both are triggered by the pressure switch. I be it is the pressure switch failed


It's my understanding that this generation uses a variable displacement compressor controlled by the PCM. PCM gets pressure data from both sides and pitches compressor accordingly based on conditions.

The PCM will typically throw codes too if it detects a problem and intentionally disables the compressor.

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1993 Buick Park Avenue - 197k - Some odds and ends done - Simply won't die
1994 Buick Regal - 78k - Bone stock - Always ready for a good kicking
1990 Oldsmobile 88 - Gone to a better place


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PostPosted: Sun Jul 15, 2018 4:02 pm 
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Year and Trim: '91 Olds 98 Regency Elite
'88 Bonneville
Tried a new pressure switch and no luck. I have no codes in regard to it either. I also forgot to mention that I did put a scanner an it and it's "calling" for AC to come on, but the compressor is not activating..... I also have power at the plug, tested it with a volt meter..... I'm just assuming I have a bad compressor at this time.


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PostPosted: Sat Jul 21, 2018 1:32 pm 
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Year and Trim: '91 Olds 98 Regency Elite
'88 Bonneville
Does anyone have a schematic of the 2000 Bonneville AC circuit? This is driving me crazy.... Direct current works the compressor, I have power to the plug, I've checked the fuse and relay, a computer diagnostic is calling for the AC compressor to be enabled, a new pressure switch did not work...... I'm stumped.


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PostPosted: Sat Jul 21, 2018 4:13 pm 
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Year and Trim: '91 Olds 98 Regency Elite
'88 Bonneville
I found the problem!! FINALLY..... it was a corroded wire, covered by the sheathing................of course the power wire was fine..... it was the signal wire.............


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