1990 525 a/c compressor - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 05-22-2008, 04:25 PM
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1990 525 a/c compressor

How can I replace my 1990 525 A/C compressor myself? I have access to a rebuilt unit but don't want to pay $400 to have my mechanic install. Can someone guide me on the installation?

Thanks,
John
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#2 (permalink) Old 05-27-2008, 02:24 AM
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fairly easy... disconnect battery.

1) disconnect A/C magnetic clutch wire at the connector
2) remove drive belts as needed so u have the A/C clutch frree and clear
3) using a schrader valve tool, slowly remove the schader valves at the high and low pressure ports( i assume there is no more freon in ur system as it is illegal to let freon out into the open air)
4) disconnect hoses at the compressor
5) remove the 4 bolts that hold the compressor to engine.

COMPRESSOR IS OUT!

to install: replace all rubber o-rings with A/C grade seals;

follow 5 through 1 to install
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#3 (permalink) Old 05-27-2008, 03:16 PM
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Darkhorse,

Thank you for the tip! I'll give it a try.

John57
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#4 (permalink) Old 05-28-2008, 09:25 AM
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After installing the compressor, go have the entire system evacuated before filling with freon so you make sure you get everything out. unless you have the tools (most shade tree mechanics don't) have the shop do the fill for you so its done to the correct pressure, etc..

Jason / 1997 528i
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#5 (permalink) Old 05-28-2008, 04:56 PM
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ADDENDUM: i forgot to mention that you'll need to add about 6ounces of R134a compatible oil(PAG 100) into the compressor to ensure there is enough oil circulating in ur A/C system.

When that is all done, i will agree with winters... spend $25.-(normal charge for Cali a/c shops) at a shop tht can properly vacuum, leak test, and charge your A/C.
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#6 (permalink) Old 06-05-2008, 12:47 AM
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is it still possible to get the old freon. is that being R134a. i need some new freon for the 5 series compressor, as it is getting hot in texas this summer and no cold air is blowing past 90 degrees. should i just have system converted to new freon based system? and in doing repair or replacement to compressor should all v belts be replaced.
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#7 (permalink) Old 06-05-2008, 09:40 AM
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Quote:
Originally Posted by pinnaclebass View Post
is it still possible to get the old freon. is that being R134a. i need some new freon for the 5 series compressor, as it is getting hot in texas this summer and no cold air is blowing past 90 degrees. should i just have system converted to new freon based system? and in doing repair or replacement to compressor should all v belts be replaced.
cars 93 and older use R-12. '94 up use R-134a. R-12 is scarcely available and costs almost 4 times the price of R-134a.

system conversion is known as retrofitting... pretty much a straightforward job.... take out the old shrader valves, introduce compatible ester oil into ur A/C system via the ports; install the new port valves; then have a shop vacuum ur system to check for leaks, then charge R-134a to specs.

change of V-belt not required unless there is obvious damage or wear.
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