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post #1 of (permalink) Old 09-15-2010, 11:19 AM Thread Starter
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07 Impala LT Compressor replacement?

Can anyone give me any guidance or walk throughs for replacing the compressor on a 2007 Impala LT 3.5L (non-flex)? It siezed up last night and the repair costs are around $800 (waiting for mechanic call with firm quote). I can find the comressor used for under $100. Now I am familiar enough with A/Cs since I did do motor swaps back in the 90s and half the time disconnected the compressors from the lines and took them to a shop afterwards for evac. I then would refill with R-134.

I see on this car that the AC is in front and down below. I have not closely examined the under hood area to make a removal plan but what works? Take it out top side or bottom side? Do I need to oil this compressor upon reinstallation or do I need to have a shop refill 134 and oil it? Do I even have to have the system evac'ed or can I just fill from having a 0 pressure in the system?
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post #2 of (permalink) Old 09-26-2010, 07:07 PM
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You absolutely must pull vacuum on the system before recharging it to remove the moisture. You need to check if there is any oil in your replacement compressor and if not, add at least 4 ounces of appropriate viscosity PAG refrigerant oil to the compressor. I am not sure how you remove the A/C compressor on these cars, but if it is similar to my Mazda 626 V6, it should come out from under the car.

Always replace the O rings in the disconnected parts of the system. When replacing an A/C compressor, it is highly recommended to replace the accumulator tank (receiver/dryer) and orifice tube as well.

If your old compressor came apart internally, there may be debris in the system and it iwll need to be flushed. I recommend that you let a competent A/C shop handle this repair. You will avoid a lot of frustration that way.
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