Date registered: Feb 2005
Vehicle: Two '87 570SECs, one '87 560SEL
Location: Las Vegas, NV
Mentioned: 6 Post(s)
Quoted: 256 Post(s)
When I got my '87 560SEL with the bad AC, I was quoted $1300 to fix it with a rebuilt compressor and that was 15 years ago. Turns out that a little sleuthing showed the compressor was leaking and "not from the front". That meant where the refrigerant lines connected were the leak. There are four o-rings in that connection block and two more on the lines. The two o-rings in the high pressure side were bad so for about $6.00, I put in six new o-rings.
Said all that so I could say this - are you sure it's the compressor that's bad? If it's just a leak, get a batch of miscellaneous AC (green viton) o-rings and some Ester Oil for R12 to lube each o-ring as it's installed, and replace all you can get to. My SEC had six of thirteen connections with bad o-rings.
I filled my SEC and SEL refrigerant systems with propane (aka R290) and run pressures of 35 & 200 psi. Very cold air!!
US '87 560SEC with Euro headlights, clear markers, H&Rs, 17x8.5/Nitto's, ATE slotted rotors with ceramic pads, BergWerks FGS, 3.07 Limited Slip. '87 560SEL with Euro Headlights, lowered, 235/40/17's