sounds like you have it set for Celsius not Fahrenheit.
Should find ECM just under center dash below radio and climate control panel
I have an 89 Delta 88 and if you have Electronic Climate Control there is a control module located just right(passenger side) of center at the firewall. It is in the same location as the blower fan resister assembly on a car with standard a/c controls.
Could be "Electrical Center" or "Electronic Control".
It is a button with a graphic of a rectangle with 3 squiggly vertical lines that cross the bottom line of that rectangle. It is located in the center section of the climate control area, which is below the radio, between the fan speed knob abd the diverter knob. If you have automatic climate control, it is above and to the right of the digital display. If you do not have automatic climte control, it is below and to the right of the temperature knob.
Press the STATUS control to access the System Check function, the message center will display A/C FILTER XX% RESET FOR NEW. Press and hold the RESET control to set to 100% , the message center will display IF NEW FILTER HOLD RESET. After a successful reset, the message center will display A/C FILTER LIFE SET TO 100%.
Center dash above the console.
hard work
Below the climate control and back of center console.
could be an emission control module. emission problems often do not affect running of car . The 1989 riv have the most comprehensive diagnostic tools available. Goto "CLIMATE" control Press and hold in BOTH "OFF" and "TEMP" Down arrow. The display will go into diagnostics and display ALL problems - History and active
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behind the glove box
Could be the ESC (Electronic Spark Control) mounted to the center of the firewall under the hood.