1998 GMC Sierra heater fan problem continued

1998 GMC SIERRA
11,500 MILES • V8 • 4WD • AUTOMATIC
Avatar
ADUBBER
  • MEMBER
  • 13 POSTS
Hello again,

I am the guy with the gmc sierra i replaced the controll console for the haeter and air cond- I replaced the relay for the fan I replaces the air door actuator, I replaced the heater blower resister
you asked me to test the yellow wire going into the resister with the fan set on low and i did this finding no power. what next?

I am will to pay more for the advise if needed.
Jan 15, 2010 at 12:02 PM
Advertisement
Avatar
KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 POSTS
Hi adubber,

You should have replied to your previuos post so that whoever was attanding to you can get notification and attend to you as soon as he gets online.

This would keep the history of what had transpired to allow an easier understanding of the problem and recommendations and repairs carried out.

Please do not edit the post as no notifications would be sent out.

Let me know the following.

With blower control speed at Low, you have no power supply to the yellow wire. Let ma know the following.
1. Do you have power at the Tan wire when blower speed is set at M1?
2. Do you have power at the Light Blue wire when blower speed is set st M2?
3. Does applying battery voltage to the terminal of the resistor at the yellow wire work the blower at low speed?
4. Did you test the HTR fuse ( 25A) in the fuse box?

I will copy this thread to the previous one and we will work from there.
Nov 17, 2018 at 1:41 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle