Without even removing the block assembly off the car For a quick ‘ fix ‘ the two barrel shaped parts of the valve assembly are the electro solenoids , undo the cross head screws that hold the outer case this will expose the water control solenoids , pull the solenoids out of the block so the water now has no restriction. Refit it all back together and bleed up and see if your heat returns .
It’s a good test to show if you have blocked matrixes .
In theory the engines water pump can push through the ‘rest ‘ pumps impeller
Iirc the rest pump does not run all the time ....it does not need to when the engines water pump is running but I suppose if the rest pumps impeller seized this could hold flow up to the matrix .
Worth a go before you buy the valve , maybe snapdragon could open his old one up and have a look to see what has failed on his .
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