Only A/C and no heat.

2001safari2001safari Member Posts: 1
edited September 2015 in Chevrolet
I have an issue with my 2001 GMC Safari, where I only get A/C and no heat. When I turn the temp up in the van it keeps blowing cold. It feels like it is still A/C and not just outside temperature air. All the vents work fine & switch position fine.

Any ideas?
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