How To Change The Thermo Vacuum Valve On A Mercedes W124 (230TE) 

You're welcome! I noticed there weren't any about this - so made one myself!

Hello Lukasz, thanks for watching! Unfortunately I don’t have the car any more so I can’t double check how they are connected 🙁

Can't be sure, should state compatibility when buying product.

Messaged 👍🏻

nereye bağlandığını buldunuzmu hocam zira aynı sorunu yaşıyorum bir yere bağlı ama yanlış olduğunu düşünüyorum

From what I remember, terrible idle and having to hold revs for a few minutes when starting up or it would stall. The only obvious damage was a snapped plastic piece meaning one of the hose pieces wouldn’t stay in place.

It was a while ago now so I can't remember to be honest!

Hello, I think I just changed it out because the symptoms the car was having pointed towards the valve.

There’s a number of things it could be. I’ve changed the OVP relay, cleaned the ICV and a number of things I can’t remember off the top of my head. If you haven’t already, join “W124 enthusiasts” page on Facebook, lots of insights there

@@JAYPCARS thanks champion 💪

More than welcome Jermaine 👍🏻

Hi, as far as I’m aware it’s for the evap system. It burns vapour and sends it to the carbon canister to help reduce emissions. Some say it’s for when engine is cold, it activates and helps start the car when cold. Haven’t found a 100% definitive answer as to which it is.

@@JAYPCARS ok thanks for your answer

It regulates ignition for cold starts. As far as I know that's all it does. Also, it doesn't matter which vacuum hose you connect to which prong, it is a throughput system. It acts as a valve in the middle of the vacuum hose and thus it doesn't matter as long as both sides are connected. My W201 also had one prong brake off, so while I was waiting for the month-long shipment (from Lithuania, it seems half the merc parts on ebay are there) I just connected the vacuum hoses to each other with a piece of plastic hose and the car worked fine in the meantime. Only the revs were a bit on the high side because as far as it was concerned the valve was always "open" so the engine was always reported as "cold" even though it wasn't.

@@jayzhead Thanks for the info, it's one of those parts I couldn't find much on, and got conflicting answers from others. Very useful to know!

@@jayzhead hi . My question is does this valve influence fuel consumption? My mercedes 190 diesel 2.5 5 cylinder should consume 6 liters per 100 kms outside the city. Now it consumes nearly 8 liters . I have no fuel leaks whatsoever anywhere. The o rings et copper spacers have been changed on the injection pump . What can i check ? I have also another air control valve for the intake manifold which works electric and with air too. Thanks.

Good info, thanks 🙏🏻

@@JAYPCARS What Mercedes car do you have ?

@@borntolate1 this was a 1992 230TE

😂😂 Only a bit of surface rust I promise!