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Heater in jeep wrangler did not work when car was at correct temp then after a half hour the heater worked what would cause that?
Wiki User
∙ 14y ago
There are two things that can affect heat output. First, is the heater core getting hot and that appears to be OK on your Jeep since it works sometimes. The second problem is the blend door. This door is under electronic control and diverts some or all of the air through the heater core. The door is on a vertical axis and if the door is broken, it can swing back and forth with bumps, turns, hills, etc. randomly switching between heat and no heat.
It sounds like this might be your issue. The door is controlled by an actuator motor that is located on the bottom of the plenum box in the passenger side footwell. If you remove the motor, you can examine the blend door axle for signs of cracking or breakage. You should be able to manually turn the axle and switch the heat on and off. If the door isn't working properly, it's a major repair from the dealer and will run into big bucks. There is an aftermarket DIY kit to repair the common blend door problem on the Wrangler and it might be worth checking HeaterTreater for more information on the problem.
Wiki User
∙ 14y ago
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