SL/R129: HVAC Display
Thread Starter
Member
Joined: May 2012
Posts: 159
Likes: 11
From: B.C. Canada
SL500, GLC300
HVAC Display
I have a 1995 SL500 with the old style HVAC (just a small display with the temperature, nothing else). This doesn't seem to work. It only shows randomly used lines instead of, for example, 21 (degree) C. But, it does show a temperature if i hold the REST button it will say 66 (degree) F until "REST" turns on and then it will just show the random lines again. Has anyone heard of this before and what could cause this? Also is there a way to fix this? 
Junior Member
Joined: May 2012
Posts: 15
Likes: 0
From: West River, MD (near Annapolis)
1997 500SL
Somewhat related....
The backlighting on my display has gone out. Are these little LED bulbs or something that is easily replaced? In daylight I can read the display and everything seems to work just fine. it's just impossible to see anything on the display at night without turning on the inside overhead light.
Thanks
The backlighting on my display has gone out. Are these little LED bulbs or something that is easily replaced? In daylight I can read the display and everything seems to work just fine. it's just impossible to see anything on the display at night without turning on the inside overhead light.
Thanks
Thread Starter
Member
Joined: May 2012
Posts: 159
Likes: 11
From: B.C. Canada
SL500, GLC300
as far as i know it isnt an LED but just a normal incandescent bulb. like all other bulbs they are probably about $6 from the dealer/mechanic. i believe you need special tools to remove the HVAC control unit. it is like one piece, like a cartridge, not just a cover over the switches.
http://www.autohausaz.com/secure/Par...298300585X.jpg
http://www.autohausaz.com/secure/Par...298300585X.jpg
Thread Starter
Member
Joined: May 2012
Posts: 159
Likes: 11
From: B.C. Canada
SL500, GLC300
no one has any idea what would cause the weird randomness of the HVAC display? no one seems to have any idea and it foes get fairly annoying for it not working. i never know what temperature it is. 
randomness of the HVAC display? no one seems to have any idea and it foes get fairly annoying for it not working. i never know what temperature it is.
