Hotwiring The Intercooler Pump on a GMC Syclone
The ECU controls the IC pump on our trucks. The stock chip turns the pump on based on engine coolant temperatures.
To aid in cooling and prevent the IC from heating up during warm up, most owners hotwire the IC pump so that it is always running.
With this simple mod, when the truck is in the on position, the pump runs. This is ideal for stock chipped trucks, and essential for stock chipped trucks with a lower temperature thermostat.
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.
Remove the two screws that hold the relay bracket to the firewall.
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.
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.