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have 2017 santa fe ultimate
a/c stopped flowing through the vents while the blower motor on high (you could hear it loudly)
shut off the car and restarted, problem went away

this has happened twice dealer says it needs to be happening to diagnose
anyone else had this problem?
 

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2017 santa fe ultimatesimilar problem but my airflow was reduced with the AC on and Off. Problem went away after turning off the system for about 10 minutes but ocurred again about 20 minutes later. After the several hour long trip with this issue we have not had it happen again...Weird..
 

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This is likely to be a "known" Santa Fe warranty problem...the heat exchanger is freezing up. Most likely culprit is the 'thermistor'. should be covered under the existing 5 yr warranty.
 
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