Rep Power: 0

Neither cooling fan comes on - temp gauge goes up to max. Checked with OBD live data - got to 215F and no fans. I put 12v directly to fans and they run. Jumped load side of relays on both rad and ac relays and fans work, so everything down-circuit from those two relays seems OK. Jumped ECT sensors (separately) and no luck. I also tried turning on AC to force them on, but that didn't work either (to be fair, AC has not worked in some time - don't know what issue is - and it's in the 40s here rn). I also tried swapping like relays around with no success. Seems whatever the issue is, it's on the control side of things as the fans do power on from the relay socket.

Looking for any ideas on further diagnosis, or which parts to start replacing (guessing relays first?). Any help appreciated.