It's starting to get colder here in the northwest, so the bus is doesn't immediately start when you crank it.

So I am starting to test the preheating side of my DIY hydronic system. Here's a run from this morning.

It was 34 degrees out and I was thinking definitely time for a preheat. However I have been also working on solar panel installs so have been running the bus twice a day as I have reposition it in the storage yard to get access to both sides of the bus.




The engine coolant value is only accurate while the preheating pump is running as the temperature sensor is in the pumping bay and from it's location it also sees a bit of eddie current heat transfer from the glycol tank. So anyway the coolant temperature started at 50 degrees and rose by 18 degrees in 30 minutes.