345 BYPASS VALVE VAC option

[kostik_xc70]

Good day to everyone.
Can you tell me who changed the 345 BYPASS VALVE VAC option to 01 Without a bypass valve (in this case, both the engine and the interior heat up). Was there an error in the cooling system after starting the Webasto heater for a short time and for a long time?
Also, who just dropped the power connector from the three-way valve, did they get an error on the cooling system after starting the heater for a short time and for a long time?
It is suspected that when the connector is reset or the configuration is changed, the software inside the climate control unit still works according to the algorithm in the presence of a three-way valve.

[petem69]

Hi,
I did this 345 Bypass valve change 3 weeks ago for a 2021 B4 V60 CrossCountry.
No errors, short or long time. Works fine.

[kostik_xc70]

Hi,
I did this 345 Bypass valve change 3 weeks ago for a 2021 B4 V60 CrossCountry.
No errors, short or long time. Works fine.

It is believed that the error occurs when several factors are combined.
By the way, along with option 345 (eliminates the operation of the three-way valve, without changing the logic of the climate when starting Webasto), it seems that option 341 should also be changed (it may change the logic of operation)

[kostik_xc70]

An analysis of the data on the car's cooling system in order to heat the interior and engine using Webasto showed that it is incorrect to change the value of option 345. It is correct to change the value of an option
341 CLIMATE SMALL COOLANT CIRCUIT on Without Small Coolant Circuit 01, and the value
345 BYPASS VALVE HVAC leave With bypass valve 02

[petem69]

This is interesting. In what way is it incorrect?
I did notice that there is less heat left for the interior, as it heats the engine also. Could the change of option 341 value help with that?

[kostik_xc70]

This is interesting. In what way is it incorrect?
I did notice that there is less heat left for the interior, as it heats the engine also. Could the change of option 341 value help with that?

The valve is not only used when starting webasto, so it is not correct to turn it off. The 341 option tells the car that it does not have a small cooling circuit and therefore, when starting the webasto, the valve does not block the heating of the engine.

[petem69]

So does it mean, that if car is told there is no small cooling circuit, during preheating webasto is heating only the engine? The interior preheating would be off.

[kostik_xc70]

Значит ли это, что если автомобилю сообщают об отсутствии маленького контура охлаждения, то во время предварительного прогрева вебасто нагревается только двигатель? Предварительный подогрев салона будет выключен.

Если указать, что нет мелкой цепи, то и двигатель, и салон (оба) будут нагреваться при работе Webasto.