Hello everyone, new to the forum. I have a 1988 300E that I am restoring with 162,000 miles on it. Seems like the comfort circuitry fuse is shorting. But my real question is what is that ticking sound coming from my glove box? I took out the glove box and found an item with numbers written on it. Seems like vacum hoses are attached to it and it just won't stop ticking. I looked at it and found a part number: 124 800 0178. I called my local dealer and auto part store, but neither could tell me what this part was, or, what it did. I queried the net, but no matches.

I would like to replace it, however, I don't know what to ask for...any help would be greatly appreciated.

Joe in Snellville, Georgia

 

was it rectangular shaped with lots of different colored vacuums attached?

if it is, then it's a switchover valve for a/c flaps.

your model doesn't use stepper motor yet.

 

Thank you, yes, it is rectangular:



[IMG]local://upfiles/14228/7E18DE8FD067430FA7415A810E177517.jpg[/IMG]

 

it's so nice you got pic of it.

yes it is the vacuum valve block for a/c.

 

Do you have any idea why it would be ticking?

 

at about what frequency does it tick? Hz. (per second).

does it happens with a/c on or off?

it is controlled by CAN.

if the signal is distorted or the a component is defective, such malfunction is possible.