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my 2004 cadillac deville AC intermmitently stops working like it is icing up...happens in humid and or night air and recovers when turned off overnight or about hour on long drives...happens in recirc or outside air mode and at setpoints of 72 degrees plus...dealer says he cannot do anything since "diagnostics" fine (it always works by time I get to dealer)...any help on this issue...occo18
 

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White Diamond '03 DHS (with DTS floor shift)
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Start by entering the onboard diagnostics and pulling the codes yourself when it happens. If no codes (DTC's) then I'd have the A/C pressures checked.
 
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