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Noises and problems under dash - AC/Heat control problems


This is a discussion on Noises and problems under dash - AC/Heat control problems within the Engine & Performance forums, part of the 3rd Gen : 2002 - 2008 category!
What would cause your heat to switch to cold by it self when you stop or hit a bump and ...


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Old 03-23-2016, 09:17 PM   #1 (permalink)
 
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Age: 27
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Ram Year: 2003
Engine: 4.7 Magnum
Default Noises and problems under dash - AC/Heat control problems
What would cause your heat to switch to cold by it self when you stop or hit a bump and just turn the fan on low? Seems like half my morning commute I'm messing with the knobs on off on off til I hear a loud flop then I know I'm in Business.


2003 Ram 1500 4.7 magnum 4x2
196k miles but well taken care of.


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Old 03-25-2016, 11:28 AM   #2 (permalink)
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Ram Year: 2002
Engine: Mopar 4.7l
Default Actuator or door
This would be one of three problems. A. is it's the blend doors that close off the heater core have broken down the shaft. If this is the case you will need to pull dash and remove the hvac box and take everything apart and find the broken door. There are 4 doors inside this box 2 that close off the heater core and 2 others for direction. B. the fresh air door has broken either the actuator or the shaft, which can be fixed by not removing the dash it's right behind the glovebox. C. It's the actuator for heater core blend doors. Which can be done by takes some dash facade off.
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