I set G0903 to 50 degrees F and set a fan #1 turn on/off delay of 10 seconds with a minimum fan run time of 30 seconds and its all working like it should. I thought the 10 second delay may be a good idea to let the engine stabilize a bit after a start rather then turning the AC and fans on right away and adding the extra load on initial start up. Seems to be working fine though. I would still like to have some way of turning them on high as needed to bring the high side pressure down. Its very common for the engine to not be running hot by any means but have the AC running very high on the high side due to a lack of air flow. I still think the AC recirculate switch could be manipulated to do this. Granted 350 psi is pretty high but at least it would be there for just in case.

 

I've bought everything minus the newer variable pressure sensor to do just this. I haven't gotten around to building the circuit though to see if it will work.

 

Do you have G0106 set for #2 fan control? You need to, if you're running both outputs for fan control

 

Yes it is.


The fans have been working very well for the past week having the low fans on with AC request and above engine coolant temp set to 50 degrees. They move all sorts of air and really don't pull much current at all. The high fans are working based on temp to. If I pull in somewhere and shut it off the engine heat soaks and gets a little hotter into the 220 range on restart at which the high fans turn on and the temp instantly falls off and the high fans turn off. I was getting a very consistant 14.5 to MAYBE 15 mpg before driving it easy and now I'm driving it a little more spirited due to the subtle power increase and I've gotten 15.7 mpg the last two tanks going to work and back for a week. The AC gets damn cold and stays cold even at idle too. I would say its worth it.