charsstone

!!!UPDATE!!! PROBLEM SOLVED!!! Hello. Sorry for being away for so long, but I had a lot of work to do, plus personal matters, but I won't go into detail about that. The point is that the problem is solved. One weekend I tried to replace the G62 water temperature sensor. It was quite tricky. You couldn't see anything, since this sensor is behind the engine, so I did it by feel. That was the problem. I don't know exactly how the old one broke, but replacing solved it. So the engine was heating up all the time, but it didn't sense it. If this had been the first thing I replaced, I would have saved 100 euros for sure. 😅 Thank you all for your help! I finally managed to solve it because of you. 😊

!!!UPDATE!!! Well, I set aside the weekend again and set about inspecting/repairing it. The thermostat was removed again. It is closed by default, it opens in boiling water. There is no problem with it. G83 sensor replaced. We had difficulty accessing the G62 sensor. We did not replace it. We sprayed the connector with contact spray. We disconnected the auxiliary heater pipe and unplugged it. No change. Maybe the water temperature indicator on the dashboard does not even show 55 degrees anymore. It blows hot air into the passenger compartment, water does not run out, the pipes leading to the cooling system do not heat up after starting. Now I have to leave this to a specialist and take it to someone who knows about TSI engines. My competence has expanded so far. I got an appointment for March 19th. Thank you very much for the help so far! ❤️ It was a good decision for me to join the group. 😊 If anyone has any more ideas or questions, I'd be happy to answer them. If the source of the error is found, I'll definitely write it down here!

Question. Can this area cause overcooling?

UPDATE! G83 replaced. No change.

Yes, it did spin the cooling fan on cold starts. It didn't do it this morning. Unfortunately, the mechanic friend I know who has the official VCDS software is unavailable, so I won't be able to read what signals the temperature sensors are sending. Car mechanics have been really busy lately, at least here in the area. They can only give me an appointment after 2-3 weeks. I'll try to replace these sensors, if it's not a nuclear physics thing, and see if it helps. I haven't disconnected the G62 yet. What will happen? So I understand correctly that the charge air cooling pump shouldn't run on cold starts? Because, as we looked, the charge air cooling pump didn't run on cold starts. But I think you can also find out this with a software readout...or can you hear when the charge air cooling pump starts?

The picture of how the cooling system works is starting to come together, but it also produced this morning phenomenon on the way home. When starting up again, the cooling fan was running at maximum speed, but after about 5 minutes of city use, the water temperature indicator on the dashboard showed 90 degrees. After 15 km, the water temperature indicator suddenly dropped to 50 and the fan also turned off. What can cause this now? Yesterday, when we removed the G83 sensor with the engine running, the fan was still spinning at full speed. Could there be a connection between this or has something gone wrong in your brain?

The exact engine type is EA211 CHPA. This Webasto heater was probably installed by a 3rd party. It has a monochrome display. I tried to adjust it, but it didn't do anything, there was no sound. I'm trying to disconnect it from the system because I don't need it. I think this could be a Webasto problem, because the engine has just started to cool down better now that it's been so minus degrees outside, so that's a good tip. I don't know about this charge air cooling circuit, but I'll look into it. The only strange thing is how the dashboard showed 90 degrees? For weeks it didn't even go above 50 degrees, even though it wasn't -8 degrees, but plus 5-10. Let's say when the temperature outside was 10 degrees Celsius, the water temperature only dropped to 70-80 degrees. Anyway, first, I'll try disconnecting the entire Webasto system to see if that's the problem.

UPDATE! This morning, after driving about 5 km, the water temperature started to rise and did not drop. It stopped at 90 degrees and stayed that way, neither going up nor down. The outside temperature is between -6 and -8 degrees. After I arrived at work, I opened the hood. The fan was spinning at maximum. I was able to touch the pipes again without any problems, but I don't know how hot it should be now. I plugged in the older OBD reader I had and it again read the water temperature around 50 degrees. I don't know exactly where it read this temperature from then. The car had a transmission repair not long ago. Before that, it threw the START-STOP ERROR, but after the transmission was replaced, it was fixed and working. This morning, it threw this error again. I thought it had something to do with the transmission, but it's suspicious that these two things happened at the same time. Now I really don't understand what's happening... 🤣

Well, I went over to a mechanic friend of mine today. It is certain that the thermostat is not open, it is certain that the engine would heat up as it should, but for some reason it cannot. It was specifically read with a VW group OBD reader. The inlet coolant temperature is 45 degrees Celsius, the outlet coolant temperature is 5 degrees Celsius. The car had already traveled 30 km. His tip is that there might be something with the auxiliary pump. My car was a police car and it has a Webasto heater. The cooling water is also circulated in this system. Could these be related? I am attaching some pictures of this Webasto.

Okey, sorry. In both pictures, it's the same 87-degree thermostat. First, I put it in boiling water. Then the metal pin at the top came out. You could see it moving outwards. Then I put it in cold water, but nothing happened, it didn't move. Here, it was already suspicious that it wasn't working properly. I've now found a video explaining how the thermostat works, so that's clear. I replaced it with another one, a Bher brand, but nothing changed. Then the internal thermostat, which is behind the water pump, was also replaced with a Meyle brand, but no change, the water temperature still shows 50 degrees. It would be strange if the new thermostats were exactly the same bad. There is no error code. All I can do is open the thermostat again and test the new ones in boiling water. (By the way, if you hover your mouse over the image, it will display the link address at the bottom left or right and say "hot.jpg" or "cold.jpg". It would have been better if I could put the images side by side, but that's how it works.)

Doesn't this TSI engine have some kind of hidden thermostat? I've looked through several diagrams, but I haven't found anything that I didn't already know was there.

We put it in boiling water. Under "Pecs" I feel the little metal rod sticking out of the top. It should slide out with the heat, right?

The second is placed in warm water, the first picture is placed in cold water. This is the thermostat that opens at 87 degrees. The pecs came out, but nothing else moved. After the hot water, we put it in the cold water, but nothing happened.

Well, I don't know. I haven't touched the water pipes of the cars after 20-30 km, but logically, if it's at operating temperature, I wouldn't be able to touch it much, but I'm not experienced. Now I looked at the old thermostats to see how they behave in hot and cold water. I'll be honest, I have no idea how it's supposed to work. I couldn't find an exact description of it. The ones we put in are not of poor quality either. One is a Behr, the other a Meyle.

Well yeah, I probably will. We have now found a water pump number 0 392 023 211. How much does it have to do with water cooling?