E-Fan problem (PCM pin related)
Jun 22, 2008 | 09:37 AM
#12
Pin 33 is only available on 03-up. On 02-down it controls the air recirc control on the A/C. EFI-Live supposedly has a custom os that lets you use 33 for fans again, but I kinda like Max-A/C. Us HPT guys are outta luck though. Like pretty much everybody else I tap the A/C compressor line for the high speed line.
Somebody needs to make a controller that taps the A/C pressure sensor so we can run the fans like they were meant to be run...
Somebody needs to make a controller that taps the A/C pressure sensor so we can run the fans like they were meant to be run...
Jun 22, 2008 | 11:16 AM
#13
I knew that already black, but can i just tap into the green wire thats already in pin 33 with a scotchlock and get the same function? I dunno even know wtf that wire does, i've been google/forum searching for like 3 hrs now and i can't find any info on it.
33 is to turn my fans on high when my a/c is on or when my temp is at 210* so i really need it, we have a cold front right now so its only 70's during the day but it's not gonna be long before 90-100's roll in again and im gonna be usin the a/c. I wasn't sure if that thin wire would have any extra strain on it or not? Surely there can't be much voltage rollin through it to burn it up.
33 is to turn my fans on high when my a/c is on or when my temp is at 210* so i really need it, we have a cold front right now so its only 70's during the day but it's not gonna be long before 90-100's roll in again and im gonna be usin the a/c. I wasn't sure if that thin wire would have any extra strain on it or not? Surely there can't be much voltage rollin through it to burn it up.
Jun 22, 2008 | 12:26 PM
#14
so wire-33 is reciculation...not needed IMO. I asked a couple of guys and they said they just pulled the old pin out and put the new pin for the fans in....i've gotta call zippy and double check that he turned 33 tom. since i don't wanna bother him on a weekend.
Jun 22, 2008 | 12:52 PM
#15
I believe so, the auto recirculation from my looking around is just mainly used for automatic climate control...
Jun 22, 2008 | 02:49 PM
#16
well called some of my buddies at the dealership and had them look it up and it's not even used on my truck so i dunno why the pin is there :shrugs:
unplugged it and put the fan control pin in...they still don't kick into high since it's not getting hot enough. 90*F outside, and with both fans running on low my temp is 185ish or so. Couple of guys said there's have never kicked in to high since both on low is plenty so whatever, they work and its staying cooler
unplugged it and put the fan control pin in...they still don't kick into high since it's not getting hot enough. 90*F outside, and with both fans running on low my temp is 185ish or so. Couple of guys said there's have never kicked in to high since both on low is plenty so whatever, they work and its staying cooler
Jun 22, 2008 | 03:22 PM
#17
well called some of my buddies at the dealership and had them look it up and it's not even used on my truck so i dunno why the pin is there :shrugs:
unplugged it and put the fan control pin in...they still don't kick into high since it's not getting hot enough. 90*F outside, and with both fans running on low my temp is 185ish or so. Couple of guys said there's have never kicked in to high since both on low is plenty so whatever, they work and its staying cooler
unplugged it and put the fan control pin in...they still don't kick into high since it's not getting hot enough. 90*F outside, and with both fans running on low my temp is 185ish or so. Couple of guys said there's have never kicked in to high since both on low is plenty so whatever, they work and its staying cooler
Jun 23, 2008 | 09:57 AM
#18
That is EXACTLY right. I added 05 fans to my 02 Sierra a few weeks back. I also used the OEM harness from a 2006 Silverado. I changed A/C AutoRecirc. to control fan #2 and then commanded series parallel fans under the fan option. Simply pulled pin 33 (its a green wire) out of the red PCM plug and taped the end of it up. They've been working flawlessly.
Jun 23, 2008 | 12:07 PM
#19
That is EXACTLY right. I added 05 fans to my 02 Sierra a few weeks back. I also used the OEM harness from a 2006 Silverado. I changed A/C AutoRecirc. to control fan #2 and then commanded series parallel fans under the fan option. Simply pulled pin 33 (its a green wire) out of the red PCM plug and taped the end of it up. They've been working flawlessly.
Jun 23, 2008 | 11:15 PM
#20
My A/C is cold as well. 03+ trucks do not use PIN33 as their A/C autorecirculate is already built into the HVAC module itself.