Discussion Starter · #1 ·
So my problem is, my 1998 ML 320 heater works but only when I'm driving or have the RPMs over 1500... if i take my foot off the gas and let it go back down to idle rev then it starts blowing cold air again.... Anyone have any idea what this might be? AC and everything else work fine too so don't think its the AC/heater acuator or whatever, since it will blow hot air if I rev the egine or drive it etc. Any suggestions are more then welcome!