Car didnt have this problem before. Swapped a new engine in, reused the old coolant temp sensor, original ECM, trans etc.
Now when i plug the battery back in, within 5 seconds the fans come on. Sometimes they will turn off if i open the driver door. sometimes when I key on. Sometimes they will turn on 10 mins after the initial boot on, and stay on for a while…and once they came on an hour later…
i swapped the grey relay under the ECM just in case but still doing it. Only codes Im getting is IAT sensor open, but that code was there from before as well… Both ECT sensors from old and new engine were reading 7.5 k Ohms at -10C ambient last night…