Jeep 55111955AB Air Conditioner And Heater Control

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For control panel vacuum tests on 2007 and earlier models, remove the check valve located behind the glove box and test it with a handheld vacuum pump. If the vacuum does not flow through or hold, replace the check valve. Reconnect the check valve in the proper direction and plug the hose back onto the intake manifold. With the control panel pulled out and the vacuum harness disconnected, apply vacuum to each of the ports on the connector. If any of the circuits don't hold vacuum, trace the lines to their destination to isolate the source of the leak and repair it. Note that the vacuum lines are colored differently according to their destination, making it easier to trace them during troubleshooting.