your heater moter is going. may be just a lose wire if it goes from hot to cold back to hot. heater moter should be passengers side near the floor. go to a recker and pick one up their fairly cheap.
wes
December 2009
hi tommy,there's a electronic valve located by your window wiper motor this allows the water flow through the heater matrix & are very common to fail hence the cold air
steray
November 2009
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