Hotwiring The Intercooler Pump on a GMC Syclone

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The ECU controls the IC pump on our trucks. The stock chip turns the pump on based on engine coolant temperatures.

With this mod, the intercooler pump will always run when the ignition is in the on position. This should result in a cooler intake air temperature giving you better performance and saftey against preignition . This is one of the first must-do mods for any Sy/Ty.

Aftermarket chips

Many aftermarket chips lowered the intercooler pump turn-on temperature. Lowering them to the minimum value of 65 F° means it'll essentially run all the time.

Intercooler turn on temperatures by chip:

  • Stock (AYBM,BBZB) - 184
  • Hood Tuned Performance: 65 F° (unless burned for e-fans)
  • 10-in-1: 65
  • Ultimate: 65-67
  • Conley: 65
  • Hypertech: 140
  • ATR Pitbull: 65
  • ATR Strip: 165 F° (to s/n 92001)
  • ATR Strip: 65 F° (after s/n 92001)
  • Jet: 184
  • KB Shootout: 175
  • Other KBs: 65-140

Gain Access to the Intercooler Pump Relay


The IC pump relay is located on the firewall, behind the upper intake. It is grouped together with another relay. It's the one furthest to the driver's side of the two relays.

Image 257 from Hotwiring the Intercooler Pump on a GMC Syclone

Remove the two screws that hold the relay bracket to the firewall.

Image 254 from Hotwiring the Intercooler Pump on a GMC Syclone

The bracket has a metal black clip that you need to pry up to slide the relay off. Press it in using a small flat head and slide the relay off the bracket.

Image 251 from Hotwiring the Intercooler Pump on a GMC Syclone

Add a wire to ground the relay on


Separate the top (the relay) from the bottom plug of the housing.


Locate the relay terminal that the yellow wire runs to and wrap/fold a short length of wire around the relay terminal blade.


Reconnect the two halves of the relay and cut the wire to the length needed to run to a ground. Any of the screws that go into the firewall should sufficiently ground the relay to keep the pump running.



There are 3 Comments.

Say Something.

What temp does the ECU turn on the pump on a stock chip truck?


The stock chip turns on the pump when the coolant temp reaches 180 degrees F.

Ok thank you!

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