Fan only comes on when A/C in turned on.

[seabass1858]

My 1991 beretta 3.1 gt has an issue where the fan will not come on when it reaches the proper temperature but I can get it to come on if I turn the A/C on. I have replaced the coolant temp sensor and still not fixed. What would you do at this point.

[88*Beretta]

coolant temp sensor

Got an URL at auto store for this sensor?

[93 3.1L]

Fan will not turn on when it reaches operating temp, it will only turn on when it reaches around 230*f or when the a/c has is turned on.

Is your car overheating? Or whats the reason for checking the fan?

[seabass1858]

It will go to the red if I let it.Before deployment it would turn on before that point.

[88*Beretta]

It will go to the red.

Can you get a thermal temp probe...and point it at thermostat housing?

[seabass1858]

Thermostat is working and I got 245 on the housing than i shut it off because heat and aluminum doesn't mix. I am thinking its the relay

[88*Beretta]

I am thinking its the relay

I'd have to see schematic.

But, if one fan, I would think ECM and AC-Max affect same relay...have to see relay's diagram to know for sure.

[3X00-Modified]

There is only one fan relay, so if it comes on with the AC then it's working.

Which temp sensor did you replace?