Filling the Coolant = Total Electrical System Freak-Out
It’s cold outside. Really cold. So imagine my annoyance that the heat in my BMW Wagen was not working well. It was barely putting any heat out.
So I Googled for some hints. There were two main possibilities returned:
- The cooling system has air in it.
- The auxiliary coolant pump is bad. Because of course there is a second, electric water pump.
Since I had drained the cooling system a while ago and apparently did not fill the system in the proper BMW way I was guessing that #1 was the correct answer, but they are both easy to check.