Heater is working intermitantly what causes this What is your question?
Heater on sante fe works and then when I stop driving the next time it does not work or it may start working after I have been driving for 15 min
What makes this problem better or worse?
Not sure it may be fine for days and then act up
How long has your 2009 Hyundai Santa Fe had this problem?
Couple weeks
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2009 Hyundai Santa Fe Resources
IF you want a guess > failing blower motor. Good luck!