why wont my AC radiator coolant fan come on when I turn on my AC and why wont my electric radiator coolant fan come when my motor starts to get hot? I replaces both of the temperature sensors the one on the top of the motor and the one in the lower radiator hose could it be the relays and were are they located on my 2002 Audi Allroad 2.7

 

Should always start with the fuses and relays first. Relays are usually located in a sealed compartment under the rain tray in front of the windshield under the hood. Under the passenger side footwell carpet on the firewall and in the kickpanel on the outside of the passenger footwell.

 

I checked the fuses they are good , but I was not sure where to locate the relays, now I know where to look ill check the relay how can I tell which one is the fan relay ?

 

It could be the control module. Here's a link to what it looks like. 02 2002 Audi Allroad Quattro Auxiliary Fan Control Unit - Cooling System - Stribel - PartsGeek

It should be located close to the fans on either side of the radiator.