Sterling, replacement insulation for the fuel cooler (and the high-pressure line that goes "around" the radiator) can be found at any good hardware store. Go to where the 'normal' hard Styrofoam-type pipe insulation is stocked and you should find the the "squishy" EPDM-type foam for high-temp lines too. Two different sizes needed if you're doing both the cooler and high-pressure line. (New factory line I have has it already.)
maddog2020 wrote: ↑Thu Jun 23, 2022 10:54 pm
I'm convinced that this rear air design is why 928's eat compressors. if you don't run the rear air every time you run the front air, oil can and does pool in those lower lines.
Pooling of the oil in the under-car lines is one factor. However, I think a bigger factor is "topping off" the refrigerant charge without adding oil.
I have seen that phenomenon reflected in numerous service record histories. It's especially visible in since-new factory-r-134a GTS histories where the charge leaked out every 2 to 3 years. What you see is two top-offs and then a compressor replacement.
maddog2020 wrote: ↑Thu Jun 23, 2022 10:54 pm
removing the rear air eliminates 10 different places the system can leak from. I'll have to remove my rear seat delete again to get the rear evaporator out.
4 under-car o-rings
2 valve o-rings
4 expansion valve o-rings
1 valve
1 expansion valve
1 evaporator
2 hoses
15 places for it to leak.
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My 928 Inspection Guide