Question about GMC Cars & Trucks
I replace a new AC compressor on a 2004 GMC envoy do the AC system need to be flush?
You do not need to "flush" the AC system, but you will need to put a vacuum pump on it to evacuate all of the air before charging with new refrigerant and the recommended amount of oil charge. It appears that the refrigerant is R-134a and the system takes 48 ounces for a front and rear system or 29 ounces for a front only system. The specified oil is PAG46 and you will need 8.5 ounces for a front and rear system and 7.5 ounces for a front only system. The first link below is the specification page and the second is a video showing how to charge the system. The big parts chain stores will loan or rent the necessary tools and will be happy to sell you the refrigerant and lubricant.
Posted on Mar 19, 2019
Try the fuel filter. Sounds like the engine might be running rough due to weak fuel pressure. Its cheaper to replace, especially if it's still original from 04. Try running some injector cleaner through a couple of tanks of high octane gas.
Posted on Aug 06, 2008
The battery is on the right side behind the fuse box. You need a metric set to undo the 3 screws. Theres one that attaches to the body, one to the bar that goes along the top, and theres one on the left side below the vacuum hose and air induction. After you've taken out those three, you should lift the whole thing out(battery and shroud) together. It's hard to take the shroud off before you lift the battery out. After that, you have to pry the shoud off the battery. The two terminals in the back make it hard. Then just go to any auto parts store and they'll give you a new one.
Posted on Jan 28, 2009
Just behind right rear tire up in the wheel well. Air inlet is inside right rear quarter near the accessory inflator. Compressor runs 3 lines one for the accessory inflator and one for each air bag.
THere are also 2 sensors, one on each trailing arm that senses load and then raises and lowers accordingly.
Posted on Feb 17, 2010
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