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Hi!"I think my 4-way valve is stuck or jammed"It's very unlikely"try to unjam it or remove the thermostat"You can disassemble it. It's very easy. Then check it in the boil. Removing thermostat is not so easy. You will need to remove 40way valve by connecting 4 pipes into 2 pipes. It's a bad idea."Does the coolant system have to be fully drained"No. Just pinch the pipes.ButTake a look at the electric pump. Is looks like it damaged or dosent works.
Hi!
"I think my 4-way valve is stuck or jammed"
It's very unlikely
"try to unjam it or remove the thermostat"
You can disassemble it. It's very easy. Then check it in the boil. Removing thermostat is not so easy. You will need to remove 40way valve by connecting 4 pipes into 2 pipes. It's a bad idea.
"Does the coolant system have to be fully drained"
No. Just pinch the pipes.
But
Take a look at the electric pump. Is looks like it damaged or dosent works.