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#1
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A/C observations
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
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#2
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What are the part numbers? My '06 probably has the variable drive. I pushed the R134 temp scale pressure to the higher end. Once the aux fan is running, at levels 1-3 it's very cold. I'm sure it's blowing below the '60 degree setting. I don't use Auto or Max settings. Variable drive is fancy for being more efficient at different RPMs. Higher speeds help remove heat faster. The variable drive changes it's pressure stroke.
The issue I've not tackled yet is the aux fan does not turn until engine is at full operating temp. It can take a few miles before it reaches temp. During that time only speed cools it down fast. If driving in city traffic, those first few minutes can be hot. I want to change the pressure switch. Unfortunately, the system has to be evacuated.
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'06 X5 3.0i - bought @143,123 miles (12/26/20) |
#3
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The valve part numbers are different and not always listed depending on who makes or supplies it. Also there seems to be a color coding involved, all pretty cryptic for someone who's not in the game. If the aux fan runs when you disconnect the pressure switch and doesn't when the high side pressure comes up then you are probably right by thinking you have a pressure switch problem. Sometimes pressure switches can be replaced without evacuating. The desiccant/drier tube is on the left side of the condenser btw if you're looking to put a new desiccant bag in while you have the system evacuated.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#4
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Once, I pulled the pressure switch. The aux fan didn't come on. It started to get warm in March. I noticed that fan didn't come on when it was at full operating temp. I finally realized the fan was kaput. Luckily, I had replaced the clutch fan earlier. The new fan works when it's at engine operating temperature. I need to pull the connection again to see it turns on. It definitely does not turn on with A/C command.
You don't have push R134 pressures high like I did. It's hot here compared to Canada. The A/C was redone in the last two years. The previous owner had A/C work listed on his ad. The compressor looks new. I wonder if they pulled a fast one on him and didn't notice the fan was not working. I pushed pressures higher and it's holding so far. A 100 degree day is nothing once the fan is running.
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'06 X5 3.0i - bought @143,123 miles (12/26/20) |
#5
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If anybody has used the BMW 64116 972 109 evaporator sensor "repair kit" it would be interesting to know if my theory about that is correct.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#6
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A search has not found any pressure charts for a variable compressor. I can tell you on a 100 degree day, mine gets to knuckle chilling <40F. Even the two lowest setting are ice cold. I have turn vents away. I'll keep looking for a pressure chart.
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'06 X5 3.0i - bought @143,123 miles (12/26/20) |
#7
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The pressure regulator I got from Arctic Air is a MT2280 (CV 75-5106 hand written on the package) 172449 etched onto the valve itself. Artic air doesn't list MT2280 for the X5 but some sellers do so I thought I would get one to check it out. I would still recommend to people replacing the whole compressor though. If you can get the Nissens for under $300 you'll be getting a new clutch, brg. and shaft seal as well and these vehicles are getting up there in age and mileage so probably a better way to go.
The variable compressor (2004-2006) is CV717. One E-bay seller has the valve listed as CV-09. I'm not totally sure how the automatic air comes into play on this, do all facelifts have auto air ?
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) Last edited by 80stech; 09-08-2021 at 02:51 PM. Reason: add |
#8
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Quote:
The issue with standard compressors is that they over-compress the refrigerant and will freeze the evaporator if they run continuously. (I briefly ran my E30 M3 with no evap temp sensor... Vent temps in the low 20s and occasionally even high teens were incredible. Until the evap froze over.) VRF compressors are amble to run continuously at optimum pressures. Net-net, without seeing a chart, I would expect optimum low side, and for the high side to rise as normal, until the system reaches the capacity limit.
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2011 M3 2006 Sierra 2500HD 4WD LBZ/Allison 2004 X5 3.0i 6MT 1995 M3 S50B32 1990 325is 1989 M3 S54B32 Hers: 1989 325iX 1996 911 Turbo |
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