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it sounds to me like the heater control valve is either stuck or bad. I think that this valve is vacum operated. check for vacum at switching valve. this valve is located under the hood, it has lines coming from radiator to it.
Second Answer
I don't believe that the Wrangler has a heater valve. This is generally used on high dollar automobiles. The purpose is to cut off flow of the coolant through the heater core under control from the heater control knobs.
More likely, the problem is either the core not getting hot(blocked) or air not being properly diverted through the core. A simple check on the coolant flow is to feel both heater hoses going into the firewall from a cold start. The two hoses should warm up at about the same rate and get uncomfortably hot. If it appears that the core is functioning properly, the problem is likely with the blend door.
The blend door is under electronic control and the actuator motor is located on the bottom of the plenum box on the passenger side. Remove the motor and examine the axle for breakage or cracking. This is a common failure on the Wrangler and Cherokee. You should be able to manually turn the axle and switch from heat to AC. If it appears that the door is bad, there is an aftermarket kit from HeaterTreater that will address and fix the problem at a fraction of the dealer cost.
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∙ 14y ago
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