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Thread: 87 535is
08-19-2008 10:04 AM #1
08-19-2008 02:10 PM #2
Re: 87 535is
Finding the correct AC parts is a PITA. Since it's an 87 it's probably a R12 system. First verify which compressor you already have. Is it a Bosch, Nippon-Denso, etc? Are you doing an R12 to R134a conversion? Some of the Bosch units were notorious for not holding R134a. I wouldn't recommend a used compressor as you're likely to run into the same issues.
In any event, here is what I would recommend.
As long as you have to replace the compressor, do a proper R134a conversion.
Remanufactured same style compressor - even if it was one of the troublesome Bosch units, new remanufactured units should have appropriate R134a seals. Try and get it dry or with PAG oil, otherwise you will have to drain the mineral oil out. Around $300 to 500.
Schrader valves to convert the existing R12 hookups to R134a hookups. About $10 to 15.
The rubber lines in the old hoses may not be ideal for holding in the R134a but recharging periodically is cheaper than replacing the hoses. An 87 may already have upgraded lines.
Make sure the receiver drier is compatible with R134a. The original R12 PN is 64531466048 (BMW list $103). The updated R12/R134a unit is 64538363555 (BMW list $231). Bavauto.com has the 64538363555 for $150. If your original drier has two pressure switches, you'll need to replace the switch and convert to a single switch.
Replace the expansion valve with an updated unit. This is not absolutely necessary but will give you better cooling performance. Original part number is 64511372077 but it has been superceded to 64511468475 (BMW List $103). It does not say explicitly that this is the R134a part but this would be your best bet. You can find the 64511372077 part as low as $32 (autohausaz.com). I saw the 64511468475 part at bavauto.com for $30.
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