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So tonight was the first time I drove my new to me 993 at night. I noticed the HVAC control panel had no backlighting, so I couldn't see to adjust temperature and airflow. Are the controls supposed to be backlit like the other controls? I would assume so. Advice on a fix would be appreciated.
After reading a bit, are there multiple bulbs behind the HVAC CCU? It seems there are bulbs behind the switches for A/C and defrosting (yellow) and separate bulbs for the fan controls (white). ALL of mine are out, so could this be a fuse that's blown?
There are two B8.4D 0,9W bulbs for the dial and rotating **** backlighting. In addition, there are miniature bulbs inside the switches for backlight and ON lights. All of them are normal yellowish incandescent bulbs. Later 993 switches have LED lights.
The switch miniature bulbs are not at all easy to replace, and the switches are difficult to dismantle without destroying them. Search here on the forum for details. The switch caps disintegrate and the catches break off. I spend about an hour or two on two switches when refurbishing and fitting LED's in them.
Cheers,
Tore
Thanks, Tore. The photos are very helpful. This still has me wondering why all of the lights are out. That seems unlikely which has me curious about a blown fuse, maybe. Is there a fuse that would control the HVAC lights alone?
Tom, just so you know, "Tore" is the man behind Bergvillfx, great supplier of great LEDs, HIDs, updated radios, and other stuff for 993s and other Porsches.
. https://www.bergvillfx.com/
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I bet Fuse 1 is blown, check the two main cabin blowers. See this web page, chapter CCU power supply and fuses for an overview of the CCU power supplies.
Cheers,
Tore
I bet Fuse 1 is blown, check the two main cabin blowers. See this web page, chapter CCU power supply and fuses for an overview of the CCU power supplies.
Cheers,
Tore
Thanks, Tore. I replaced Fuse 1 but that was unsuccessful. I'll check in with my local mechanic tomorrow.
Mystery solved! I had 30k service performed on Thursday and they forgot to reconnect the wiring harness that runs over the pollen filter housing which apparently powers the CCU.
Mystery solved! I had 30k service performed on Thursday and they forgot to reconnect the wiring harness that runs over the pollen filter housing which apparently powers the CCU. Annoying but a simple fix.
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. ”Whew!” says the guy (uh, me) who sold Tom the car a few weeks ago.
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Last edited by centerpunch; Jan 26, 2021 at 09:25 AM.
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HVAC lighting
