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The diagram might help you with understanding of operation. I am no expert but I would check flow from the auxiliary water pump (140) as well as flow through the valve (56) make sure connection were not left off or the piping changed after the valve job. The pump (140) should be running at idle if the heat is on. If you put the heat to max and the fan to max (not auto) there is still no heat?
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2010 ML350 Bluetec
2012 Mustang Convertible
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