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Check the heater tap turns on and there is good water flow through the hoses and heater core ,check that the water temp is at least 85 deg.cel.. could also be the baffle in the heater core broken off.
Sounds like the heater core may be blocked..First check the level make sure its full..Then let the vehicle get up to operating temperature..Feel the heater hoses going into the firewall..Both should be hot to touch..If one is hot and the other one is warm or not warm ,,then you have a blockage in the heater core..If its block ,,then i have cleaned them out by taking the heater hoses off,,and running a garden hose through the heater core..If that doesnt work then you have to remove the dash,,and replace the heater core..
you are correct - its called a heater control module,mounted on heater case under dash - i believe it is only available at dealers,but i could be wrong
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