Burning Up in Atlanta - PeachParts Mercedes-Benz Forum

symplered · #1 06-15-2007, 03:32 PM

Need help before I faint while driving. Experiencing hot air flowing from my passenger side vent and underneath on my 95 SL500. Any suggestions would be greatly appreciated.. Thanks!

TX76513 · #2 06-15-2007, 03:38 PM

Have to ask - did you check fuse? No power = default to heat.

symplered · #3 06-15-2007, 04:12 PM

Heater/AC works just fine. When everythings off, albeit, not a heavy flow, hot air flows constantly flows through my vent. Do you think that it could be a heater valve problem? Might I add the problem is intermittent....

TX76513 · #4 06-15-2007, 04:29 PM

Have you checked the mono-valve. The 140 class has three different versions they install. The 126 class will blow hot through the defrost when it goes south. There is some good reading if you do a search "mono valve" you might pick up on some specific 140 information

symplered · #5 06-15-2007, 04:46 PM

Thanks! I'll do that.

bobterry99 · #6 06-17-2007, 10:19 AM

Quote:

Originally Posted by symplered

Need help before I faint while driving. Experiencing hot air flowing from my passenger side vent and underneath on my 95 SL500. Any suggestions would be greatly appreciated.. Thanks!

I would put the climate control in diagnostic mode and check for faults. I would also monitor the temperature of the heater core. The procedure for doing this on a dual-zone car is explained by Steve Brotherton in a DIY article on this site. The procedure for an SL is explained on the R129 Tech DVD and is similar. If you need help, you can send me an email.