[osdesierto]

I noticed a water dripping noise coming from the dashboard when I turn on the heater. I thought of nothing at first two days then decided to pop the hood yesterday. I saw a unplugged that is conneced to the side of the fan which is connected to the coolant reservoir -- about 3 feet hose. Turns out the it was slowly spraying coolant to the side of the ABS housing. The coolant level wasn't low enough to lite up but I was lucky enough to check and popped the hood.

Whew, good thing it would have been a little more than $6 coolant quick fix up if I didn't check.

She is running like a champ again. I just push the plud in and make sure it's in tack. So far so good! no more leak and water noise in the cabin!

 

[janos_z]

i don't think the two things are related. my w126 does this every winter, and as far as i know everything is okay...

 

[RGubbioli]

My w124 also has that sound of water coming from the heater inside the cabin. Heat is ok though and there are no discernible leaks anywhere so am waiting to see what happens next.

For now it just puzzles me big time! [:0]

 

[osdesierto]

Interesting.... mine did not have that sound until i discover the leak.

 

[Jase]

My w124 also has that sound of water coming from the heater inside the cabin. Heat is ok though and there are no discernible leaks anywhere so am waiting to see what happens next.

For now it just puzzles me big time! [:0]

I have the same noise, like slurping water, when the heater is turned on. I've used the heater alot this winter and I don't seem to be losing coolant.

Does anybody know if this sound is normal or if something is broken?

Thanks,
Jase:thumbsup:

 

[mrnickleye]

Hello everyone. the sound you are hearing is due to some AIR trapped in the heater core (the part that gets hot from the water). You NEED to get as much out as possible because the air 'gurgling' around inside causes corrosion of the metal parts, thus a leak is coming, sometime.

See; "Possible Problems" down the page:

Heater core - Wikipedia, the free encyclopedia

My car had a retrofit device added by the dealer to help remove (and prevent) the air from becoming trapped.

A good MB tech (shop) should be able to 'bleed out' the air.

 

[Jase]

A good MB tech (shop) should be able to 'bleed out' the air.

Thanks mrnickleye
Do you know how to get the air out and what the part is that needs to be installed to help with this?

How does air get into the system in the first place?

Thanks,
Jase:thumbsup:

 

[mrnickleye]

I don't know what the part is called, but I know it was added on because I found it out on that 'official' MB parts site that I signed up for.

I don't know if it was used on other cars than the 300CE.

One method of bleeding the air out is to raise the front end of the car up as high as you can, like 2ft. then with the engine warmed up, run it for 5 minutes at approx. 2000 rpm with the heater on high temp setting.

The air should come out and go to the plastic bottle.

 

[Jayare]

On my 300CE the thermostat housing has a "bleeder" bolt on top. EZ to get air out. Not sure if the 230 has the same arrangement.

Good Luck,

Jayare

 

[tuttebenne]

There is also a bleeder on the cylinder head of 103 motors. It looks like the head of a bolt mixed in where the row of sensors is.

 

[Jase]

Thanks for the replies all. I'll have a look at it this weekend.

Jase