I ran a power line from the battery terminal to the yellow wire going into the resistor and the blower run on low, I did the same with the brown and it runs the fan on med and on blue it runs on med high
the high comes on if you turn it to high before starting the vehicle
i9f you have it on any other setting and start the vehicle it don't but will turn on after a few seconds or minutes no pattern.
I tested the 25A heater fuse and its good I found a aircond- relay in the fuse box under the hood and replaced it but that didn't change
I noticed that the air cond- don't come on at first when you push the button and after a while the light on the panel turns on.
From: "firstname.lastname@example.org" <email@example.com>
Sent: Sun, January 17, 2010 1:56:14 AM
Subject: Topic Reply Notification - 1998 GMC Sierra heater blower resister
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Bob, Ken and all of the 2CarPros team.
Monday, January 18th, 2010 AT 10:35 PM