Question about 2003 Hyundai Santa Fe

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Okay so our ac/heat only works on the high setting and they say it is a simple fix just need blower motor resistor. is that true? is that the correct name for the part? and what is the deal with the 3 wire or 4 wire system and why does the same part seem to range for $2.50 to $100

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It is the blower motor resistor. that is the correct name. hyundai used 2 designs in the resistor because they switched from old to new design. Thats why they ask if its a 3 or 4 wire. not sure on the price.

Posted on Apr 28, 2010

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Posted on Jan 02, 2017

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What is an AC diode fuse? I have a 2006 AWD Pontiac Torrent the AC/Heat doesn't work, I've changed all fuses for the HAVAC and still no AC/Heat blowing out of vents. What could be the problem?


Could be a number of thing's ! Testing the electrical circuit is the way to find out what's wrong . Using a wiring diagram and a DVOM - digital volt ohm meter . Videos on youtube showing how to test it ! Without testing i would only be guessing . Does it work in high speed ? In high speed it by-passes the resistor . If it doesn't work in any speed more then likely the blower motor is the problem !
Air Speed
The HVAC control assembly applies ground to the blower motor control circuit that corresponds to the selected blower speed. The resistors and the blower motor are in a series circuit. The following list represents the number of resistors in series with the blower motor per particular speed request:
• Low speed--3 resistors
• Medium 1 speed--2 resistors
• Medium 2 speed--1 resistor
When the operator requests High speed, the HVAC control assembly applies ground directly to the blower motor through the high blower motor control circuit. The resistor card has a fusible link which, if blown, will require that the card be replaced.

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That's what it sounds like to me.

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The resistor will cost you 12 dollars at your local dealership. It's located under the passenger side dash and is very easy to replace. The resistor installed at the factory is defective and the new one from Mopar is the correct resistor. It would be worth you while to replace it now while you're working on the blower motor. The blower should still work on the high setting, even with a bad resistor but, replacing the resistor may fix the problem.

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