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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E65 / E66 (2002 - 2008)

7 Series - E65 / E66 (2002 - 2008)
Discussion of BMW's 4th generation E65/E66 7 Series flagship. The E65 generated much controversy, due to its radical styling and iDrive user difficulties. Nonetheless, the E65 broke records to become the best-selling 7-series iteration ever, especially after its 2005 facelift.

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  #1  
Old 06-12-2015, 08:49 PM
chako84 chako84 is offline
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Location: Los Angeles
 
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Mein Auto: 2002 bmw 745i
Air conditioning problems

Hello everyone I have a 2002 e65 and I'm having air conditioning problems air was working fine and one day to another it stopped blowing cold the mechanic said it was the compressor so I had it replaced recharged the system and still won't cool does anyone know what could be the problem thanks
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  #2  
Old 06-18-2015, 08:33 AM
AbsoluteBMW AbsoluteBMW is offline
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Get a scanner on it and check for HVAC system codes. Could have something to do with the electronic side of the HVAC system and not the mechanical at this point. Does it blow at all? hot or warm.
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Old 06-18-2015, 09:46 AM
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spyders 745li spyders 745li is online now
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HVAC system 2nd dairy water pump

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Old 06-18-2015, 02:24 PM
chako84 chako84 is offline
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Yeah it blows hot air but when the ac is on and the heater is working fine
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Old 06-26-2015, 06:47 PM
nycjxm nycjxm is online now
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Have your mechanic check the heater control valve this normally doesn't show up with a scanner.. the heater control valve turns off the coolant flow so the air blows cold the other possible problem is the actuator behind the dash. The heater control valve is on the drivers side near the cabinet filter I'm the engine compartment
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Old 06-26-2015, 06:52 PM
chako84 chako84 is offline
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Oh okay I'll have him check that out thanks but lately the ac has been turning on by itself at least 4 to 5 times within like a 45 min period if I'm driving and I'm out in about I hope it's not a electrical issue
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Old 06-28-2015, 06:57 PM
Mid7er Mid7er is offline
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AC quit on me today. I checked the AC with gauges and tried to recharge a can of r134a. It wouldn't recharge with 75 psig on high side and 300 psig on low side. That would be a symptom of a bad compressor. The car only has 70k miles.

Anyone know if the ambient temperature sensor would have something to do with it. E39 and E46 owners indicated that the bad temp sensor often is at culprit to shut down the AC. Did a search on E65/E66. Nada nothing anything about the temp sensor. I checked underneath and the sensor looked fine and MMI display showed correct outside temperature.
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Old 06-28-2015, 07:02 PM
Mid7er Mid7er is offline
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The only hvac codes I got off the scanner is 9C5F AND 9C60 LEFT/RIGHT VENTILATION TEMPERATURE SENSOR.

Does those code has something to do with shutting down the AC??
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Old 07-05-2015, 09:30 PM
Mid7er Mid7er is offline
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Aux cooling fan was the culprit for not turning the AC compressor on. Traced down to the fan wiring and plug into 12v. No go. Sprayed WD40 into the fan motor and turn it a few times. It started spinning and AC is back online. Check your aux cooling fan before replacing the compressor. Also found that ventilation temperature sensor is inside the center vent. Loose wiring connection. All is good now.
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Old 08-05-2015, 09:19 PM
oldham4 oldham4 is offline
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Good to hear that you have resolved your problem. Where is the aux fan located? I may need to check that myself.

My problem is that the AC blows cold when I first start the car, but blows warm while I'm in park after the car has been driven for awhile or has sat in the sun. If I sit through a long stop light, the air will begine to turn warm. Once I start driving for a few minutes, the situation resolves itself. It's as if enough air is forced through when I drive, but not when I am stationary.

Thanks,
George
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Old 08-07-2015, 05:05 PM
Mid7er Mid7er is offline
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You should be able to see the aux cooling fan in front of you when you open the hood. Turn the a/c on and the aux cooling fan should spin immediately. If not, its the faulty aux cooling fan. When was the last time you had the ac system recharged? Freon level might be low. Be sure to add pag46 oil 4 oz should suffice to intermix into r134a freon.
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Old 09-01-2015, 08:52 AM
oldham4 oldham4 is offline
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I had the system recharged last fall. When it blows cold, it blows very cold. I doubt it's the freon.

I had the car in for service yesterday. The dealer wanted to replace the compressor for $1,200 parts & $950 labor. Yikes! Since it works most of the time, I elected not to do so.

I really think that this is another problem, but the service tech says that the compressor has a valve inside that can cause it work Intermittently.

I'm going to use INPA on the aux fan to see if I can change speeds, etc. I'd also like to recharge the r134a, but don't know where the port is located in my '07 750i.

Thanks,
George
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