my 04 honda civic hester blows cool air

Asked by Aug 25, 2015 at 11:57 AM about the 2004 Honda Civic Coupe EX

Question type: Maintenance & Repair

o4 honda civic on heat mode only cool not warm

2 Answers


When Hesters (heaters) blow cold air it could be the hose going to the heater core is blocked or the valve is not opening. In reality there are a few other issues that could do this but the easiest to check is flow from the coolant to the heater ,,, other issues could be be ,,,, a malfunctioning ; blender door,, a bad temperature setting sw. ... a disconnected vacuum hose.


There may be something wrong with your heater core.

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