Originally Posted by SnakeOiler

Here is some additional information that hopefully will clear up some issues in this thread:

1) Radiator size - this is the size of the core. 34" is what you definitely need to use the 05+ fans.

2) A radiator with oil cooler is no problem, just block off those passages in the radiator if you don't have an oil cooler. I have a radiator like this and although I have bought the oil lines/cooler, I have not installed them yet.

3) When using the factory harness, don't cut off the GT150 connector for the PCM leads. All you need is the female GT150 connector and some of your own wire to run to the PCM. Of course, if picking the harness at the junk yard, just make sure to take this complete connector. If you need the GT150 female side connector, I found one here with the terminals seals and lock. Delphi GT150 Series 2 Way Female Wiring Loom Connector

4) You can definitely use the factory harness and control the both fans through the PCM for 1999-2002 models. I believe GMCtrk has a 1999 and did this, nonnieselman did this with his 2000 and I have done this with my 2002

5) A cool little tool when working with connectors and terminals is this removal tool


6) Using the 05 fan settings as previously posted is a good way to go. However, I own an '02 and decided to go with 2002 Camaro fan settings and have had no issues whatsoever



7) Just to clear up any misconceptions about fan speed: the fans do not have separate speeds. A particular fan will at a particular RPM based on the voltage that is receives.

When both fans spin at "low speed", it is because they are in series, thru the use of the relays, and are receiving 6 volts each.

When a fan is at "high speed", it is because the fan is receiving a full 12 volts of power, because now the fans are in parallel mode.

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Originally Posted by Loski

Hello I know this is old but I’m looking to do this conversion on a 04 express conversion van is the set up the same as on a truck like your saying