e-fan question
Jan 24, 2011 | 04:22 PM
#1
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TECH Junkie
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From: Providence Village, TX
e-fan question
i put an e-fan harness on my truck that i bought from Blackbear, it works great but i want to run both power wires to the ecu. one is already on pin 10 (i think) which is controlled by temperature, the other is currently tapped into an AC power wire. the one in the AC power wire makes the truck surge. i dont want the other fan to only come on with the AC but rather set it at a slightly higher temp than the truck normally runs at in case it starts to overheat even without the AC on.
is there another pin on the ecu that is also temperature controlled?
the truck in question is a 2002 silverado. thanks
is there another pin on the ecu that is also temperature controlled?
the truck in question is a 2002 silverado. thanks
Jan 24, 2011 | 04:38 PM
#2
I just installed fans and a harness on my 2002 Silverado as well. Mine used Pin #42 for the temperature On/Off (Known as FAN #1 in HPTuners) setting, and also the AC trigger wire. I've read that Pin #33 (I believe it is) would enable/run the high speed (FAN #2 in HPTuners).
I have the same concern about only having high speed fans when AC is on, AND temperature being met. No idea how to bypass, or work around, the way it is now though. I'd like to be able to, even manually, turn on BOTH fans to high speed if needed.
There is an Idle Airflow setting that should be changed in the tune to compensate for the AC/fans.
I have the same concern about only having high speed fans when AC is on, AND temperature being met. No idea how to bypass, or work around, the way it is now though. I'd like to be able to, even manually, turn on BOTH fans to high speed if needed.
There is an Idle Airflow setting that should be changed in the tune to compensate for the AC/fans.
Feb 14, 2011 | 08:41 AM
#5
On The Tree
Joined: Sep 2004
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Pin 33 in the Red connector is the pin you need. You'll have to remove the wire for the recirculation door and change the tune in the PCM from recirculation door to fan #2. You'll also need to rewire the relay because the PCM supplies a ground.
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Feb 22, 2011 | 08:35 AM
#8
So I push the recirculation button and it works as normal right? When does the pcm do it on its own? I guess I'm asking what function do I lose from the pcm not being in the mix?
Feb 22, 2011 | 08:44 AM
#9
On The Tree
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Here you go.
Originally Posted by GM SI
Recirculation Mode
The recirculation door will move automatically with an input from the A/C high pressure recirculation switch at approximately 2413 kPa (350 psi). The PCM will place the A/C system in recirculation mode when a signal is sent over the A/C refrigerant high pressure cut-out switch signal circuit. The recirculation actuator door control circuit is grounded by the PCM to ensure that the actuator is forced to the recirculation position. This allows for the cooler inside air to flow over the A/C evaporator and cool the refrigerant, until the high side pressure returns to normal. This action will allow the high side pressure to return to normal pressure at a faster pace. The recirculation door will move back to the outside air position when the high side pressure reaches 1724 kPa (250 psi).
The recirculation door will move automatically with an input from the A/C high pressure recirculation switch at approximately 2413 kPa (350 psi). The PCM will place the A/C system in recirculation mode when a signal is sent over the A/C refrigerant high pressure cut-out switch signal circuit. The recirculation actuator door control circuit is grounded by the PCM to ensure that the actuator is forced to the recirculation position. This allows for the cooler inside air to flow over the A/C evaporator and cool the refrigerant, until the high side pressure returns to normal. This action will allow the high side pressure to return to normal pressure at a faster pace. The recirculation door will move back to the outside air position when the high side pressure reaches 1724 kPa (250 psi).
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