Ecotec is V5 compressor?
Then Loose (bypass) clutch switch. V5 doesn't need this. See 87-88 Fiero L4 A/C wiring diagram... 87 L4 came w/ V5.
All system should have High and Low cutout switches. USEPA/USDOT now requires cars to have high cutout to prevent over pressure the system and cause refrigerate escaping from blowout. If you refit the old system and didn't have one then add it.
Many have 2 high switches... 1 normal high pressure, 1 higher pressure as a backup.
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)