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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?

The new speakers KICK BUTT. Infinity Primus. No looking back. As it turns out, 5 years ago I installed the Retrosound R-69Ns. One is still good but the other one blew out. I figured out which two wires were needed, don't use the blue and blue/white stripe wire set, they are not needed.  Next up: replace the factory door speakers with the NOS ones I have in storage. All I have to do is find them...........

I went thru some of this non-compatible B.S some 11 years ago when I updated my A/C system to 134.  I had already purchased a newer 134a compressor to replace the original R12 compressor that was leaking, at THAT time I didn't realize that the manifold hose assembly ends (fittings) had been redesigned for the 134a systems. Seeing as I HAD to purchase the 134a manifold assembly for the redesigned compressor... I did NOT want to replace all of the other hardware, the new manifold would NOT fasten to the older receiver/dryer because the threads were altered........ all of this fell into play as I had also updated the brake vacuum booster, the larger booster required a *newer* 134a liquid side A/C delivery pipe. The newer pipe was redesigned to go under & around the larger dia booster & would NOT fasten to the older design receiver/dryer, the fitting threads were not the same. I had to cut off the ends of the newer pipes & cut off the ends of the original & swap the old fittings to the new pipes & tig them into place. Hopefully you can avoid all of the B.S if you keep everything compatible. The 96 V5 compressor is near identical to the older V5 with respect to its *clocking*,  what IS different (besides the rear housing casting) is the mounting points openings...where the older item has threads cut into the flanges the newer design sees thru openings with no threads cut.