High and low pressure coolant system

[Leonidas]

Hi everybody
New to this forum
Just got my new Utility wagon
I was wondering why there are high and low pressure coolant tanks
I cannot find any explanation how the system works ,which part of the engines are cooled by the high and low pressure systems no want to pressure is actually provided by belt or electric for example
could somebody point me in the right direction?

 

[TCMColorado]

Inquiring minds want to know. Why does the B58 motor have a high pressure and low pressure cooling loop?

 

[parb]

One is the cooling loop for the engine itself.
The other is the cooling loop for the intercooler.
The intercooler works on a lower temperature than the engine coolant loop.

 

[TCMColorado]

Does the low pressure loop also feed the heater coil for the HVAC system or is that the high pressure loop?

 

[CountyV8]

It's all in here plus more

https://bmwtechinfo.bmwgroup.com/tech_training_manual/ST1505%20B58%20Engine.pdf

 

[parb]

Does the low pressure loop also feed the heater coil for the HVAC system is is that the high pressure loop?

The heat exchanger for cabin heat comes off the engine coolant.
Page 42 in the technical doc above

 

[Leonidas]

Great many thanks for your responses, very informative
And quite a bit of bedtime reading

 

[TCMColorado]

It's all in here plus more

https://bmwtechinfo.bmwgroup.com/tech_training_manual/ST1505%20B58%20Engine.pdf

This should be a permanent addition to the resources section of the forum.

 

[255/85]

It's all in here plus more

https://bmwtechinfo.bmwgroup.com/tech_training_manual/ST1505%20B58%20Engine.pdf

Though we all refer to the above file, the B58 engine used in Grenadiers is a different version. The cooling system in particular shows quite a few changes.

Here'a a brief video comparison that touches on the cooling system changes...

View: https://www.youtube.com/watch?v=zY0ZrSjrgWs