Burnt Out HVAC Instrument Panel Light Bulbs

About year ago in my dashboard a light bulb for controlling the vents went out on my H3 Hummer, making it difficult to see which setting I had the ventilation on. A few months later, I had two light bulbs that didn’t illuminate on my HVAC (Heating, Ventilation, and Air Conditioning) Control Panel which began to make choosing the setting on the instrument panel difficult at night. I called up GM about getting it fix but all they want to do is completely replace the GM Part No. 15840354 CONTROL, A/C Instrument Panel, or with the part ACDelco 15-73909 GM Original Equipment Heating and Air Conditioning Control Panel with Rear Window Defogger Switch. Expensive and very wasteful I found out how to get my hands on the light bulbs from a guy on eBay. Replacing the light bulbs only took about 15 minutes of my time. Now I’m on the hunt to purchase a large quantity of them so that I can sell them to on my websites shop.

Begin with putting your finger in the cigarette light socket and put up to release the dash. I know it sounds weird, but trust me it woks amazingly. After which you’ll need to remove four bolts that hold the HVAC Control to the dash with a 7mm socket (or at least that is what I used).

GM 15840354 CONTROL, AC Instrument Panel H3 Hummer Light Bulb doesn't Illuminate dash pulled out

I used a 7mm socket to remove the HVAC Control System from the dash panel.

H3 Hummer HVAC GM 15840354 CONTROL, AC Instrument Panel Removal Light burning out Bulb

I’ve now disconnect the wires so that the HVAC Cluster is detached from the dash panel so that it’s easier to work with.

GM 15840354 HVAC Instrument Panel Removed to replace the light bulb H3 Hummer

Carefully I used a very small flat blade screw driver to separate the back cover of the HVAC.

Prying Open H3 Hummer HVAC fixing a light bulb

The back cover came off with very little effort by starting a one end and slowly working my way to the other end.

HVAC H3 Hummer Apart with old light bulbs exposed for replacement GM

With a simple switch of that small flat blade screw driver I was able to remove the H3’s HVAC light blub. The new light bulb is on the left, and the burnt out old on on the right.

H3 Hummer HVAC GM 15840354 Old Light Bulb on Right Fix Illumination

In this image I’ve place the three old light bulbs I’ve replaced on the right with a new one on the left. Might as well replace them all while I’m at it.

H3 Hummer Light Bulbs three on the right old burnt out

Within 15 minutes I was able to finish whole project, but had wait few hours to get this photo of everything back together.

H3 Hummer GM 15840354 CONTROL, AC Instrument Panel Light Bulb Burnt Out Repaired

Post Categories: H3, Hummer, Parts, Repair
Comments
  • Pietro says:

    Thanks. You saved me lots of cash with this fix. I had the exact same problem with the lights. Also with the driver side window controls. Ordered lights for both from Ebay seller. Thanks again.

    • Rob says:

      I did get the rear wiper control knob opened and the bulb is changeable. Question is now what is the correct bulb. The bulb is similar to the bulbs above in the HVAC unit but looks a bit longer and wider even though the base fits perfectly. Any chance the bulb specs are known?

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