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Idle speed is computer controlled and is not adjustable. If the speed is incorrect you could have a sensor or actuator malfunction. Other causes include a vacuum leak.
Defroster actuator lost vacuume[manual control] or locked up[electronic ATC]....
vacuum diagram "R" us !
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This is a stupid system, but heres how it works. Electronic control on dash engages motor in transfer case to engage vacuum sensor on the transfer case, completes vacuum circuit from engine to vacuum operated shift cable under battery tray, cable pulls shift fork inside front diff half shaft, which engages passenger front axle. Very common problem with these is that the vacuum actuator on the transfer case gets stuck, so vacuum is constantly applied to the shift cable actuator, causing it to be in 4x4 all the time. Under the battery tray is the vacuum actuator for the cable, see if it has vacuum when 4x4 is supposed to be off, if so you will have to replace the sensor on the transfer case (not an easy task), or disconnect the vacuum line to the cable actuator to release the shift fork and prevent further damage. Hope this helps, Justin
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In front of the radiator
Try google, your local library, or go to a dodge website, or www. howstuffworks.com
on top of the transfer case. You should see 4 vacuum lines going to the top of the switch
how to replace a blend door actuator on a 1999 ford ranger
The 1999 Dodge Neon horn is located in the front of the engine compartment. The horn will be on the right hand side of the radiator.