Is it possible to program the fan to come on via the chip? The reason I am asking is because I dont have my fan switch hooked up because of clearance problems bewteen the head and the headers I just had the little plug that goes on the A/C unpluged so the fan would run when the car was started. So yesterday I plugged the plug to the A/C and the fan came on at 170.

I have a custom Ed Wright chip

 

If you have electric fans, the answer is "generally yes you control them through the ECM".

Why I say "generally" is because the ECM on a dual fan car only controls Fan #1, the ECM does some checking on Fan #2 but the ECM cannot turn it on; GM did not put a driver in the ECM to turn on Fan #2. You need to change the Fan Temperature Switch in the passenger head to control the temperature that Fan #2 comes on.

Also, in the ECM, you can modify the "MPH" that Fan #1 turns off when you have the A/C on, along with the temperature. Generally, if the A/C is on, Fan #1 will remain on until you reach just over 35 MPH.

 

This is for a 1985 TPI with the single fan. So what your saying is that I dont really need the fan switch hooked up. Thanks