Dear Forum!

I hope you can help for me! My name is Balazs from Hungary and i have a really annoying problem with my lovely RRS. There is no heat on the cabin when i set 28-28 celsius on an ATC module. I found the problem the changeover valve solenoid is stuck in position. I ordered a new one from Gates (i tested it with laboratory power supply, close when energized) replaced it. when the coolant temperature is warm there is no heat in the cabin...in the morning when the fuel burning heater is working the solenoid is working too , the warm water goes to the heater core and there is a heat in the cabin. Can you help for me what is the problem??!!😳only there is a heat in the cabin when the fuel burning heater working.
Sorry but my english is not perfect.[/b]