Hi all, I’ve been at this all afternoon and have hit a brick wall.

2010 8th gen Civic EX R18 motor auto tranny

when I put the key in the ignition the drivers side engine cooling game stays on until I remove the key.

Ive replaced all the fan relays under the hood. Coolant flush OEM Honda thermostat

both upper and lower ETC sensors with know good parts.

I grabbed freeze frame data and the ETC is showing -40

the Temp gauge on the dash as far as I can tell is behaving normally as it should.

i live in S. Florida so it’s not the end of the world but I really really want to get this solved ASAP.

ECU may be the next move however that pretty invasive.

im also going to check for continuity at the ECU perhaps there’s a short somewhere.

please please please. What else can I try?


from what I can tell now the AC fan behaves like it should. Goes on and off normally and only ever turns on when the compressor is calling for cooling.