heat blows cold suddenly?

merkurmadness

Registered
while driving to work in the morning both of our mkviii's do the same thing. with the heat set in automatic @77 seems like we come off the freeway and they act like the blend door acts up and starts blowing cold air(I've changed mine I know it has an elect. motor) anyone notice this on your cars? if we kick the temp up few degrees starts working again.
 
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