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Fix Your Jeep Wrangler Heater - Driveway Diagnostics

Posted in How To: Electrical on April 12, 2014
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So far, “Driveway Diagnostics” has been about getting the Jeep to run better. But we find our- selves in the middle of winter with an ’06 Wrangler whose heater no longer has speeds 1 or 3 on the dial for the heater, with 2 working only sporadically, and with the blower motor making funky grinding noises. So while we aren’t showing you how to make the Jeep run better, we will show you how to save some money by not just throwing parts at it and doing the work yourself.

For short-wheelbase Jeeps, there isn’t a whole lot that normally goes wrong with the heater system. Occasionally a vacuum line comes loose or a cable clip breaks, but those are easy things to fix because you can see them. Most AMC CJs, YJs, and TJs lose heat or A/C because the blower motor or resistor have died or are in the process of dying. Usually if one goes, the other one is already on its way out, so it is often best to replace them together.

There is a lot of confusion about how these parts work together. Fortunately, we had a couple of heater boxes on the shelf, so not only can we help you troubleshoot your HVAC system, we can play one of our favorite games of all time -- show and tell.

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