I have a 2000 jeep wrangler, the heater and ac only work on full blast. It also only blows out of the defrost vents. How can I fix this?
you have 2 problems...first find the vacuum leak......
The blower resister for the fan has malfunctioned. Replace the blower resister and all fan speeds with work. The dash vent control is powered by engine vacuum. If there is a loss of vacuum from a hose the default position is defrost or blowing up on windshield. Find the vacuum leak and you will have air flow from the dash vents
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