Fans on when ignition in accessory position
 

I have an issue with the fans turning on once the ignition switch is turned into the accessory position, as in supplying power, but the car is not running. I have reset the prom multiple times and even replaced the prom. disconnected the temp switch on the inj housing, and even trying jumpering the AC high pressure line switch

Thoughts, I think the only other potential issue is ECM?

Re: Fans on when ignition in accessory position
 

Is the engine warm?

Re: Fans on when ignition in accessory position
 

No this is from the moment you turn on the switch, even when dead cold

Re: Fans on when ignition in accessory position
 

I should probably mention its only the primary fan... and I did swap relays with same result

Re: Fans on when ignition in accessory position
 

Check if your A/C pressure switch is unplugged or bad. (on high side line with red upper body)

Re: Fans on when ignition in accessory position
 

I jumpered the connector ..... didnt change anything, also does the car have to be running to turn it on due to the pressure switch.... this happens on mine in accessory mode

Re: Fans on when ignition in accessory position
 

So Lee, with ignition ON but not running, do fans come on?

Re: Fans on when ignition in accessory position
 

Yes engine is off and fan 1 cones on not both


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Re: Fans on when ignition in accessory position
 

If the connector is bad or unplugged the fans will run all the time. I am not sure if jumping it will work or if it is a resistance number it is looking for.

Re: Fans on when ignition in accessory position
 

Is this a new calibration u put in, or has the prom always been there and now this is happening? Does SES flash once on initial ignition ON?