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Originally Posted by graewulf
check the vacuum connector at the back of the heater controls. you probably knocked it loose when changing the radio, its just arubber plug that pushes on (on most vehicles). it will look like a plug with a number of small vacuum lines going into it - usually all on one connector. It'll be right at the back of the control.
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Yup! The stock radio is shallower and narrower than aftermarket radios. This is the case with YJ's anyhow. Very common for them to interfere with the heater controls. Pull the radio out and investigate, I'm sure you'll find the problem.