I'm in need of assistance. 1992 Camaro RS 305 TBI converted to 1988 TPI Vin F. According to the GM manual for V8 Vin E, my stock fan setup was controlled by three switches: A/C pressure switch (where is this?), Coolant fan switch, and A/C control head. Swapping over to the 88 Vin F setup, the ECM appears to control the fans solely, but through the fan temp sensor and A/C pressure switch. Does this seem right?

Recently, I've been burning through fan relays, causing my fans to shut off and the car to overheat. Having dissected the relays, I found melting of the relay between connections D and F. The fan fuse hasn't burned out, so it would seem the issue is on the signal side. How would I diagnose if the problem is with my ECM or one of the switches? The only change I can think of that might have caused this is a new prom chip (I have been driving around with an auto chip for a while and had it switched to manual). Any advice is appreciated. Thanks in advance.