Given that it is also getting colder here, and therefore only need the heater again for months.
However, it is blowing cold air. I have already looked at whether there was a water flow from the outgoing side of the heater in the engine room. This was reasonable. However, with a warm engine, the output pipe is lukewarm. Not so hot as input.
There is a T junction where the water also goes to the LPG evaporator. I only noticed a cold heater last year when the temperature dropped even further...
Heater not hot
