Question about 2007 Hummer H3

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Turned on heater switch and nothing happened - 2007 Hummer H3

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A good place to start would be to check the fuse or relay. Most fuse box/ relay centers have diagrams inside the covers that indicate which fuse or relay is used for that purpose. The easiest way to check this without the use of test equipment is to substitute the suspect fuse with one of the same amp rating from another part of the fuse box or a relay with the same part number. If this is not the problem then, the control head itself could be bad or a problem that will require more advanced testing procedures. Most common locations for fuse box/relay centers are : Under the hood, glove box, passenger side kick panel or inside the trunk. Keep me updated on your progress if you are interested in further assistance. Thank you for using fixya.com

Posted on Nov 07, 2012

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Posted on Jan 02, 2017

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1 Answer

Heater controls


If you mean the fan switch is not turning anything, you'll have to replace the blower switch in the dash. If the switch turns but nothing happens, you'll have to check the resistor and fan relay for power.

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Maybe check for a fuse that is blown, or maybe the heater control has burnt out.
Is it a digital display one or is it just a simple fan switch?

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1 Answer

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