On my recently purchsed 07 Crewman the heater cannot be controlled by the temperature knob on the dash , As soon as the dial is turned past the 1st indent the heater goes to full blast heat . On Checking the heater valve on the motor I see it has been replaced but some ###### wit has replaced the last 100 mm of vac hose with clear plastic which has collpased flat .
I would have thought that there should be a vacum restictor in the vac line somewhewre to help control the heater tap .
Can anyone shed any light on the heater vacum line please.