G35 Sedan V36 2007- 08 Discussion about the 2nd Generation G35 Sedan 2007 - 08

AC compressor and expansion valve replacement

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Old 06-23-2019, 02:08 AM
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AC compressor and expansion valve replacement

To make this a short story my ac compressor on my G is shot (it actually somehow split and or cracked ) I want to save money and install a refurbished one from ebay which are guaranteed to work. I'm going to also have to change out the expansion valve and wanted to see if anybody has any experience with this task and could give me tips or advice.
After the install I plan to take it to an ac shop and have them recharge the entire system and boom cool ac in my car again.
If this helps at all i live in tucson AZ if anybody knows a shop here that does this type of work that'll be great
 
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Old 06-23-2019, 12:23 PM
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The compressor blew because of improper amount of oil in the system, have you been recharging it with R134A yourself?

You will need to bridge/bypass the compressor and expansion valve and liquid flush the entire system before vacuum/recharge, there are microscopic bits of the compressor blown into the system. I would disassemble everything, take it down and have them flush components individually while it's disassembled, have them use electrical tape on the fittings when done just to keep impurities out. Then reinstall a new compressor and expansion valve, take it back down for leak test/vacuum/refrigerant.

Unfortunately it's a pretty expensive process when the compressor explodes like that.

Buy compressor oil, use it to lubricate every single o-ring. Anything disassembled needs new o-rings, make sure you are buying the correct o-rings, I prefer HBNR but neoprene will work fine for automotive use. Use a reputable supplier or you might end up buying some really old o-rings that will have a short life.
 
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Old 06-23-2019, 01:50 PM
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I never recharge ghe system the entire time owned it for 5 years one day the ac just working.
Ok so how would I go about bypassing the system?
Also does it matter what oil I use for the compressor I remember seeing a video where oil is being added inside the compressor.
 
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Old 06-23-2019, 03:33 PM
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You won't add oil to the compressor, the AC tech will do that when charging the system, it's added with the refrigerant with an adapter on the suction line.

The tech will bypass the components and flush, it's an expensive machine used to do that part, just leave everything disconnected.

Basically once you remove everything, drive the vehicle down and let them do the flush, then take your car back to shop and install everything, then drive back down for the nitrogen test / vacuum / recharge.

Call around to various local shops and see who has the equipment for the flush as well as a good price. Might end up going to one shop for the flush and a second shop for the recharge.
 
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Old 06-25-2019, 12:21 PM
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About to do mine, the compressor locked the other day and smoked the clutch. Going to be fun turning wrenches in the heat
 
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Old 06-25-2019, 05:29 PM
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Originally Posted by terrasmak View Post
About to do mine, the compressor locked the other day and smoked the clutch. Going to be fun turning wrenches in the heat

Back in 2013 had my AC compressor clutch I guess locked up and snapped off. It was laying on the underbody shield. When I took in for warranty claim... they said we will have to charge you a diagnostic to see if anything wrong... I said...here I will save you the trouble here is the broken off clutch piece.

Extended warranties usually are a waste but my Infiniti Elite paid for AC compressor replacement, new steering rack as well as a transmission torque converter replacement. Warranty was around $1700.
 
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Old 07-06-2019, 01:39 AM
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Mine is all swapped now, just have to put my intakes back on tomorrow and my dash back together. Ripping the dash apart was the worst, not looking forward to rebuilding everything.
 
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