Originally Posted by hrich
Ok i just installed a new a/c control unit in the dash of my 99 wrangler because the old one quit controlling the fan speed. So i just got a new one. I got it put all back together and now it only blows air out of the defrost. It worked fine on the old one.If anybody can help me it would be great. thanks
When the blower motor ages it melts the wires in the switches. You fan speed and the the controller that controls where the air goes can melt. The later switch is controlled by electric switch and vacuum. If it has melted it could be leaking and therefore unable to control the direction of air flow. There can be other reason too, this is just one I encountered.
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