Hi
No i have no Option here, to Flush it with a Garden Hose
I only can remove the 2 Hoses from the engine Bay, Put on the Inlet a Hose, and Blow in by myself *lol*.
I think its Blocking inside, Water cames out from the Outlet, but not as Fast as i blow in the Inlet.
Also thing with the Blocking Problem, the Water cant Circulate in the Heater normaly...
We have no "Pressure" Water pump, only a Circulation Water Pump.
I also installed a Secondary Water Pump, (Bosch), but this thing only does 0,2 Bar. (Its a Circulation Pump too...)
I HAd installed a Park Heater (webasto Thermo Top T), Runs Perfectly, Engine Hot- Inside the car Cold.
It must be the HEater matrix.
I Changed the Front Water Cooler (Radiator) too. so i dont want tu use any "Coolant Cleaner".
But the LAST Thing i can Try is, to Remove the 2 Hoses (Engine Bay) Connect the 2 Pipes together (So i can Drive ...).
Feed the Heater Matrix Manually with a Coolant Cleaner, Close the 2 Connections, Wait 3-4 Days, and then try to Blow it out...
I test it...
Greetings