I have the temps lowered on my pfc... but not to low. And I recently grounded the black fan box by the ecu. It was working great keeping my temps down and staying on for cool down after shut down. But NOW they are on all the time. From the second I start the cold engine.

Thank in advance

 

i dont understand what u mean by grounding the black fan box by the ecu?... if youre talking about the add on that mazda did later on, you dont need to run that fan mod with the pfc...

 

Thats the box that I grounded. My fans never stayed on for a cool down period.. but they do now with the box connected? Can the pfc control that? My temps would get as high as 112 c after shut down

 

I also have a fc thermosensor but Ive have that for over a year. It must be a relay or something electric? When searching the only thing I found was possibly the thermosensor plug not being plugged in. but thats not the case....

 

Undo whatever it is you did.

 

+1

 

I connected the black box months ago.... and it all worked great. Only recently the fans come on when engine is cold.

 

The fans are on when the AC is engaged. So if you leave your AC on then the fans will come on as soon as you put the key in the ignition. That could be the problem

 

Thanks for the response... but I checked that my ac is off

 

did u relocate your fan relays? (the ones on the pass side strut tower)

 

I havent relocated my fan relays... How do I know if one is bad? I think its my black box... I unconnected it and they work normal. Im letting it cool down and going to reconnect the box and see if the fan come on immediately