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2005 E-fan Install

99Silver6.0

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99Silver6.0 Senior Enthusiast

99Silver6.0

Posted
Posted

.....With the help of some booze of course. 2005 fans, 145amp alternator, 34" radiator. Took longer than I anticipated. Had to make a trip to the hardware store for some stainless bolts real quick. But went somewhat smooth. After I got the tune worked out with the help of a guy on PT.net. I made my harness copying a GM schematic I got. It all works flawlessly using PCM pin 33 and 42. Full high and low functions just like a 2005-06 e-fan equipped truck. No hacking into the a/c clutch wire.

DSC01489.jpg

DSC01490.jpg

DSC01493.jpg

  • 2 weeks later...
chevhot Enthusiast

chevhot

Posted
Posted
.....With the help of some booze of course. 2005 fans, 145amp alternator, 34" radiator. Took longer than I anticipated. Had to make a trip to the hardware store for some stainless bolts real quick. But went somewhat smooth. After I got the tune worked out with the help of a guy on PT.net. I made my harness copying a GM schematic I got. It all works flawlessly using PCM pin 33 and 42. Full high and low functions just like a 2005-06 e-fan equipped truck. No hacking into the a/c clutch wire.

DSC01489.jpg

DSC01490.jpg

DSC01493.jpg

do you still have the wiring schematic for what you did ?

i have a 04 2500 HD with a 8.1 and would like to do the same thing

thanks

Rick

99Silver6.0 Senior Enthusiast

99Silver6.0

Posted
  • Author
Posted
.....With the help of some booze of course. 2005 fans, 145amp alternator, 34" radiator. Took longer than I anticipated. Had to make a trip to the hardware store for some stainless bolts real quick. But went somewhat smooth. After I got the tune worked out with the help of a guy on PT.net. I made my harness copying a GM schematic I got. It all works flawlessly using PCM pin 33 and 42. Full high and low functions just like a 2005-06 e-fan equipped truck. No hacking into the a/c clutch wire.

DSC01489.jpg

DSC01490.jpg

DSC01493.jpg

do you still have the wiring schematic for what you did ?

i have a 04 2500 HD with a 8.1 and would like to do the same thing

thanks

Rick

 

 

If this is too small or hard to read I can email it to you.

Schematic.gif

 

I notice a bit crisper throttle. I havent done a MPG "test" just yet. Still need to do that.

SilveradoGM Enthusiast

SilveradoGM

Posted
Posted
.....With the help of some booze of course. 2005 fans, 145amp alternator, 34" radiator. Took longer than I anticipated. Had to make a trip to the hardware store for some stainless bolts real quick. But went somewhat smooth. After I got the tune worked out with the help of a guy on PT.net. I made my harness copying a GM schematic I got. It all works flawlessly using PCM pin 33 and 42. Full high and low functions just like a 2005-06 e-fan equipped truck. No hacking into the a/c clutch wire.

DSC01489.jpg

DSC01490.jpg

DSC01493.jpg

do you still have the wiring schematic for what you did ?

i have a 04 2500 HD with a 8.1 and would like to do the same thing

thanks

Rick

 

 

If this is too small or hard to read I can email it to you.

Schematic.gif

 

I notice a bit crisper throttle. I havn't done a MPG "test" just yet. Still need to do that.

 

 

I have noticed less fan noise , especially after setting at a Red Light and taking off , use to the clutch fan would make a God awful sound .

No real gains anywhere else though , just quitter , oh the A/C does seem to get colder faster .

I think you could have the PCM cut off the fans at say 60 MPH and gain some MPG ?

Draenor Senior Enthusiast

Draenor

Posted
Posted

Was the new radiator and alternator required to add the e-fans? I too am intrested in adding this. Also to reask what Chevhot already mentioned, is the ECM needing reprogramming. I see you use EFILive and will be purchasing it in the next month or two.

99Silver6.0 Senior Enthusiast

99Silver6.0

Posted
  • Author
Posted
Was the new radiator and alternator required to add the e-fans? I too am intrested in adding this. Also to reask what Chevhot already mentioned, is the ECM needing reprogramming. I see you use EFILive and will be purchasing it in the next month or two.

 

Yes it does need the bigger raddy. The alternator is just an insurance policy IMO. Plus it was OE and only $70 bucks new. As for the PCM yes it will need tuned. I had to set up pin 33 and 42 for the series/parallel fans. This harness does NOT require splicing into the clutch wire. Which I dont care for doing anyway. The above harness allows the PCM to have full control of the fans. One nice feature of this is the fans will not be kicking on and off every time the clutch engages/disengages. Which is not idea! They operate by head pressure instead. Stock GM has fan 1 and 2 set to cut at 45mph. When Is ay fan 1 and 2 im referring to the PCM outputs. The way these fans act is....... While running if the engine temp is at the point I set with EFILive, fans come on low. If the temp is at setpoint AND the a/c head pressure is at setpoint, fans come on high. If the engine temp is below set point and the a/c pressure comes up, fans will come on low. Overall its a nice seamless way to control fans. And its working great for me.

 

Below is how I have my fans set to run:

fanson.jpg

SilveradoGM Enthusiast

SilveradoGM

Posted
Posted
Was the new radiator and alternator required to add the e-fans? I too am intrested in adding this. Also to reask what Chevhot already mentioned, is the ECM needing reprogramming. I see you use EFILive and will be purchasing it in the next month or two.

 

Yes it does need the bigger raddy. The alternator is just an insurance policy IMO. Plus it was OE and only $70 bucks new. As for the PCM yes it will need tuned. I had to set up pin 33 and 42 for the series/parallel fans. This harness does NOT require splicing into the clutch wire. Which I dont care for doing anyway. The above harness allows the PCM to have full control of the fans. One nice feature of this is the fans will not be kicking on and off every time the clutch engages/disengages. Which is not idea! They operate by head pressure instead. Stock GM has fan 1 and 2 set to cut at 45mph. When Is ay fan 1 and 2 im referring to the PCM outputs. The way these fans act is....... While running if the engine temp is at the point I set with EFILive, fans come on low. If the temp is at setpoint AND the a/c head pressure is at setpoint, fans come on high. If the engine temp is below set point and the a/c pressure comes up, fans will come on low. Overall its a nice seamless way to control fans. And its working great for me.

 

Below is how I have my fans set to run:

fanson.jpg

 

 

What amp relays , and fuses did you use ?

70amp relays (one SPDT and two SPST) and two 40 amp (fans) and one 10 amp (power source) fuse ?

LS1truck , has the same diagram there .

99Silver6.0 Senior Enthusiast

99Silver6.0

Posted
  • Author
Posted
Was the new radiator and alternator required to add the e-fans? I too am intrested in adding this. Also to reask what Chevhot already mentioned, is the ECM needing reprogramming. I see you use EFILive and will be purchasing it in the next month or two.

 

Yes it does need the bigger raddy. The alternator is just an insurance policy IMO. Plus it was OE and only $70 bucks new. As for the PCM yes it will need tuned. I had to set up pin 33 and 42 for the series/parallel fans. This harness does NOT require splicing into the clutch wire. Which I dont care for doing anyway. The above harness allows the PCM to have full control of the fans. One nice feature of this is the fans will not be kicking on and off every time the clutch engages/disengages. Which is not idea! They operate by head pressure instead. Stock GM has fan 1 and 2 set to cut at 45mph. When Is ay fan 1 and 2 im referring to the PCM outputs. The way these fans act is....... While running if the engine temp is at the point I set with EFILive, fans come on low. If the temp is at setpoint AND the a/c head pressure is at setpoint, fans come on high. If the engine temp is below set point and the a/c pressure comes up, fans will come on low. Overall its a nice seamless way to control fans. And its working great for me.

 

Below is how I have my fans set to run:

fanson.jpg

 

 

What amp relays , and fuses did you use ?

70amp relays (one SPDT and two SPST) and two 40 amp (fans) and one 10 amp (power source) fuse ?

LS1truck , has the same diagram there .

 

 

I used 3 SPDT full 50amp N.O. Tyco relays with resistor supression. 70amp relays have bigger spades at terminal 30 and 87. I didnt want to use them because the relay sockets are too hard to come by. The schematic called for 40amp fuses on 2 relays and a 10amp for the middle. I used 30amp instead after some advice from a very knowledgable user on LS1Truck. Although he did say one 30amp fuse was enough for the whole harness.. I wanted each relay to be fused.

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