PeachParts Mercedes-Benz Forum - View Single Post - Strange whistle, ABS light and other woes.

RichardLSU · #1 10-21-2010, 10:22 AM

Car: 1985 300SD

If I'm driving down the road, with the fan/ac/heater on, once I "level out" I begin to hear a high pitched whistle noise some of my friends have mistaken for the turbo whine. If the fan is off there is no noise. The moment I let off the throttle or increase it the whistle stops momentarily, until the car "levels out" again. After recently doing an intake modification, I removed the EGR and ARV lines and plugged them up, along with making plugs for the EGR and ARVs respectively. I immediatly noticed that this whine was gone. The car ran like crap so I hooked them both back up and the whine has returned. This has been a constant mystery for me, any ideas?

Second, recently, since the weather has started to get cold, for no particular rhyme or reason my ANITLOCK light has been coming on on the dash. I'm not sure I'm feeling any real difference in braking power but it worries me. Might I have a sensor going out? When I start the car it will either come on or it won't. If it does come on it stays on until I stop the car and shut it down. When I turn it back on again it might come on, or it might not. I can't seem to figure out the variable here.

Third, my heater. This thing seems to have a mind of its own. If I turn on the car, and let it idle, it heats up real nice and toasty. But while I'm driving down the road it seems to blow only cold air. When I come to a stoplight or stop for any period of time, the car will warm back up again. I know its going to be cold here in a few months and would love to have this taken care of.

I've been having A/C problems and one of the things suggested to me by my mechanic was to replace the little flaps that cut off the outside vent. My a/c is working great now, but not as cold as I feel it should be. He said that by replacing those flaps it won't let outside air in and it will be recirculating the cold air already inside the car. Could this be the source of my heater problem too? Any input is greatly appreciated.

Thanks guys! This car of mine would not be running if it wasn't for all the great information provided to me by this forum!