What determines when the fan comes on?

[kab]

What determines when the fan turns on and off?

 

[marko138]

Engine temp I think.

 

[uly luigi]

yep, I think it's in the rear head

 

[kab]

Anyway I can test that? My fan isn't turning on but works when I test it in ecmspy

 

[uly luigi]

it should show up in ecm spy diagnostics

 

[GOduc]

Engine temp sensor is is rear cyclinder head, can see wire coming out of sensor. And also your fan not coming on isn't always a bad sign. You might be slightly rich and temp is OK. If fan is working properly then I wouldn't worry. If you were hypothetically running really lean, and therefore, hotter than normal and your fan kicked on all the damn time, then I would worry. If you think you may problems, check your fuse and the temp sensor itself. They're like $40 from Harley anyway.

 

[konarider94]

check the resistance of the temp sensor to see if it is within spec or not.

 

[dave_xb12r]

There is a little gnome that has to spit on the back of the cylinder every once in a while. If it sizzles, he pushes a button. Don't go feeling around for him, he bites. HD thought this would be profitable. We'll see how that holds up.

 

[kab]

Lol ^ ok all is good. I think somethin happened when I just flashed the fuel maps only to my bike. I went back and made backups of everything again and burned the whole EEPROM and went for an hour ride and when I got home the fan kicked on. I do appreciate all the info I received in such a short time. You guys are great, even you Dave.......

 

[Zeroflat24]

There is a little gnome that has to spit on the back of the cylinder every once in a while. If it sizzles, he pushes a button. Don't go feeling around for him, he bites. HD thought this would be profitable. We'll see how that holds up.

hahaha [up]