PeachParts Mercedes-Benz Forum - View Single Post

dmorrison · #6 01-13-2005, 02:16 PM

You don't want to replace the heater core if you don't have to. The job requiers removing the center dash, dash and the heater/evaporator box. taking that apart and replacing the heater core. a large job. I know I had to replace the evaporator in my 82 300TD.
chack all the connections in the engine bay. at the fire wall are 4 tubes that the hoses are connected to. Make sure the clamps are tight. And make sure the tube the firewlal seals are tight. Hopefully the clamp is loose and the antifreeze is leaking into the heater box.

Part 2. If the core is leaking then try this method to repair it before you remove the dash. Find a pump and mix some water in a large container. Add radiator leak stop and pump the mixture JUST thru the heater core. Isolate the core form the rest of the car/engine system. Hopefully you wil be able to seal the core this way and not have to replace it. The leak stop works by drying and hardening when exposed to air. So as it leaks out the heater core it will dry and plug the leak. Larry Bible tried this method with success. It's worth a try. Your heater core is divided into 2 halves. That is why you have 4 tubes. You may try to determine which half has the leak by isolating the halve over time and seeing if the smell goes away. then you can try the pump method on the leaking half.

To see what's involved in getting to the heater core search for my post on replacing the evaporator in my 300TD.

Here is the car with the dash out, scroll down.

http://www.peachparts.com/shopforum/showthread.php?threadid=80341&highlight=dash+dave

Dave