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This is a sort of trivia item, mildly interesting. I was searching the Buick E Body 86-92 parts book and stumbled across the ignition system breakdown over these model years. According to the parts book, GM offered a Delco style three coil ignition on the 3.8 engine in 86 & 87 (LG3 & LC3) before it became the 3800, and they did so in parallel with the Magnavox style for the same time period. It appears the ICM portion of the ignition is different as there is no separate base plate, and the coils mounted to the module with studs that came from below with nuts on top to secure the coils. Three of the studs were double ended with the lower end extended to function as the mounting point to the engine bracket. The coils themselves carry the same part number as the later models so maybe useful for junkyard hunting? According to the parts book, only the Magnavox was offered, and the Delco style was dropped completely, for the 3800 LN3, 88-90 in the Buick E Body? The modern version of the Delco ignition reappeared with the L27 Tuned Port engine in 91 in the E Body. The only reason I mention the specific car lines is the 3.8/3800 engines had several years of parallel use in different car lines. The Tuned Port L27 was first installed in the 1990 Buick Regal, not the Riv or Reatta?

yes the cover is on the port and the climate control dose work just no diagnostics

Gas mileage is way to low, both before and after replacing the heater core. Should be at least 19-20 even around town. What code did you get for the climate sensor fault? Knowing the code number would help diagnose the problem. Could you have pulled one of the vacuum lines loose when replacing the core?