411 controlled fans and A/C ?

[chevydillan]

Have a 411 swap and dual electric fans. They work great and are controlled by the computer. My question is how to get them turn on when the A/C is on? They currently do not turn automatically with the compressor.

 

[chevydillan]

Bumping this up. I've got all winter

 

[sunlitcomet]

Believe you can can just set "G0903 Cooling Fan #1 will turn on if the engine coolant temperature is above this value and the A/C is on". just put in a non-freezing ambient temperature setting in it. I think that would solve your issue.

 

[Goldhawg]

Believe you can can just set "G0903 Cooling Fan #1 will turn on if the engine coolant temperature is above this value and the A/C is on". just put in a non-freezing ambient temperature setting in it. I think that would solve your issue.

I'm looking into this too, as I want to install my 0411 soon. I think you have to change to a 3 wire sensor; I found this on HP tuner's site:

"You should be able to control the E-Fans based on ECT ... but if your Blazer has A/C you will not be able to control the E-Fans when the A/C is activated (i.e. based on A/C pressure). For this functionality you will need to wire an A/C Pressure Sensor and alter the system segment. Typically a Camaro segment is used - but this would cause issues with your Blazer's IPC. If you don't have A/C - this is a project a novice could undertake. If you do have A/C - I would recommend a great deal of further self education prior to beginning, or retaining the services of a reputable professional tuner.
http://www.hptuners.com/forum/showt...into-my-98-Blazer-quot-what-to-do-quot/page2&

http://www.ppepower.com/forum/viewtopic.php?p=104242&sid=250cb7f901eefe90e469d5ba2e474a2d

If you figure this out for sure, plz come back and post.

 

[chevydillan]

I'm thinking an extra relay switched by the compressor but that's all the thinking I've done so far. I don't have tuning software yet so anything like what you posted is out for the time being.
I will update when I work on it again.

 

[Goldhawg]

I'm still working my swap now, should know in the next week if this works, but I'm following the direction of Lextech, see here:

http://www.pacificp.com/forum/viewtopic.php?t=11014&start=60