pacerdonfl

My coolant temp started rising (I'm in Fl, A.C. is on) and stopped and found out that cooling fans not working.
Having some knowledge but no diagnostic tools, replaced all 3 cooling fan relays behind the drivers headlamp.
Bingo, fans started working - thought it was such a good day - fixed on first try.
2 days later, fans quit again. So something is burning out one of the relays.
Any suggestions please on how to locate the actual problem? Maybe a fan motor dying or shorting out???
Thanks for looking at this thread!

/Don

dicer

And how do you know the relays are burning out? Have you checked them?

pacerdonfl

Hi Dicer - did not check relays but replace all 3. Then fans and system started working again for 2 days, then failed again.

/Don

dicer

Maybe not the relays. Could be the temp switch/ sensor at the bottom of the radiator.

pacerdonfl

Hi Dicer - the temp gauge on my dash is working perfectly - would that be form the same sensor, or does the one on bottom of radiator just go for the fan control?

Thank you for checking!!!

/Don

dicer

The bottom radiator is for fans, the temp gauge one is behind the engine coolant temp sensor on the right front side of the coolant manifold.

ImEbo

hey

did your electric aux fan worked? what did you replaced?

i’m working on a ls400 96 project mine not working (sometimes it dose when i turn on auto mode) just wondering under what condition should it works