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Putting all of the *hardware compatibility* aside for a moment.... what ECM/PCM are you using to drive that L67? Are you using the 1227727 case or the 1614936 case?.........with a burned chip tune for an eeprom These are OBD1.. or are you using an OBD2 pcm?

I'm not sure I'm 100% following your suggestions. It also conflicts with one of the *very* old L67 swap guides from motorswap.org, which says you need 3.4 DOHC (assuming LQ1?) lines. If *that* is true, then I already have all the correct lines because they are shared with the LH0 in the '92 Cutlass. I'm posting photos and what I've found so I can try to decipher the specific differences between at least these three models. 92 Cutlass, 3.1 LH0 and 3.4 LQ1:   92 Regal, 3.8 L27:   98 Lumina LTZ, 3.8 L36:     All of these share the same evaporator, so that's not an issue.   There are two condensors, they have slightly different dimensions (and may or may not physically fit if interchanged), and while the inlet and outlets apparently have the same fittings, they are positioned slightly different. 52452050 (89-93 and 94 Lumina): 52481282 (94-01):   There are several different driers. Looks like all w-body up to 93, plus 94 Lumina all have the same one with threaded connectors, one male and one female. There's another from 94-97 that *looks* the same with one male and one female threaded, and a service port added. Possibly interchangable. The one in the 98 Lumina is unique to only the 98-01 Lumina and Monte, with one threaded and one o-ring compression fitting. These are obviously not interchangable without also changing both lines. 2724686 (87-93 and 94 Lumina): 2724929 (94-97): 01132767 (98-01 Lumina and Monte):       The compressors probably have many versions, but just looking at these three cars we have: 89018893 in 89-93 and 94 Lumina, all without 3.8L. 89019355/1522130 in 89-94 with 3.8L. 89018897/1521662 in 96-04 with 3.8. Supercharged 3.8L 95's (and 94 S/C Regals) got their own compressor, 19169371/1520434. Between these there are at least three different fitting types: HD6, HR6, and V5. The aftermarket for these is all mixed up, showing multiple types available for the same car, so I don't know which is which!  For comparison, here's the back of a V5: And an HR6 (suction and discharged are swapped but otherwise looks the same aside from being polished and the rotation which may be the part itself and/or just the photo position): Another labeled HR6 that looks completely different from the previous: And I couldn't find a clear picture of an HD6, it might just be a mislabeled HR6.   Now for the lines... From the drier to the evaporator. 10223050 in 88-93 and 94 Lumina. 19244605 in 94-97 (also listed for 95-97 Lumina and Monte even though there's a separate part number for those). 10445945/1531213 in 95-01 Lumina and Monte. From the evaporator to the condenser. 10220973 in 89-93 and 94 Lumina. 1533130/10190636 in 94-97. 10407722 in 98-01 Lumina and Monte. From the compressor to condenser and drier. 14099685 in 92-94. 52362087/1530113 in 92-93 Regal 3.8L. 10226168/1530241 in 94-95 Regal 3.8L. 10407721 in 98-99 Regal and Lumina 3.8.   Now... Have I gotten myself any closer to picking which components and lines I need?! I don't think so! 🤣 I assume I will need a compressor out of another 3.8, maybe specifically a Series II 3.8, just to get it mounted to the engine?

Point is, if the heater core is plugged with rust/scale/slime/garfelderfarb, the inlet should be hot, and the outlet cold.  You're saying it's the other way around.

I wouldn't think so since I get heat sometimes.  But, I did re-do the intake manifolds and went back to stock on the heater lines.  I had ghetto tapped into the coolant lines for a turbo that I took out and went back to one without water cooling.  I don't think I messed anything up, but it's definitely possible.

Question, or statement? Are you sure you have the correct flow-path through the heater core?  You haven't reversed the inlet vs. outlet...right?