Can you hear the blower fan? Its in/under the passenger side dash. I had the problem your describing. I found that if I was going 55 mph or faster, the cabin would start to warm up because the atmospheric pressure would force the air in.
Guys, any thoughts? My '96 C280 seems to having a heating problem. When it is cold outside (3O degrees or colder), the cabin inside never gets hot. The temp gauge stays around 80, & even though I have the cabin temp set to its 'hottest' it never gets toasty in there. I have a company car (to lame to mention what it is), and you can fry eggs in there it gets so hot, so I'm thinking there must be a problem. Thermostat maybe?
\'96 C280 Sport
black on black
19x8.5F 19x9.5R Replica CLS alloys
235/35-19F 275/30-19R Nankangs
lowered (cut stock springs)
clear corners
headlight eyelid covers
Nokya Arctic purple 8500K bulbs
PBR/Axxis pads
chromed doorlock pins
Can you hear the blower fan? Its in/under the passenger side dash. I had the problem your describing. I found that if I was going 55 mph or faster, the cabin would start to warm up because the atmospheric pressure would force the air in.
1998 c280 (WHITE)
Kenwood Excelon KDC- X579 Head
KAC iP500 Ipod Interface
2 Kenwood KCF-w3012 1500Watt 12\" Subs
Sony GTR2002 1200 Watt Amp
More Mods To Come
Have you checked your cabin air filter? If it is really dirty, not enough air will flow through.