Help !! trying to troubleshoot the cooling fans , I have only one fan coming on on the drivers side , I cant get the passenger side to come on , does anyone know what temps these are supposed to come on at . The highest temp I have seen so far is 220 .

 

Passenger side fan is controlled by a temperature switch on the passenger side head between cyl 6 & 8 and will come on at a temperature of 238F

 

so , if the engine temp never gets to 238 , then the fan will never come on . Is there a way to test that , use 12 volt jumpers maybe ?

 

Try this link it should answer most of your questions
https://www.thirdgen.org/forums/cool...ans-arent.html

But in short yes you just need to ground the drk green/white wire thats on the relay

 

perfect explanation : thank you . Any preference on a performance chip .