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    ericstewart's Avatar
    ericstewart Posts: 13, Reputation: 1
    New Member
    		  
    #1

    Nov 13, 2007, 05:29 PM
    A/C compressor
    Hello I have a 1996 Dodge Ram 1500 with the 5.9l engine. I noticed today that there was something clicking on/off several times while the engine was running. I popped the hood and found it was the A/C compressor cycling on/off for some unknown reason. I had the defrost on and the temp. control on slightly warm. Any ideas as to why this is happening ? I don't believe this would be a normal operating condition.:confused:
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #2

    Nov 13, 2007, 05:50 PM
    It's Normal.

    If the outside air temperature is cold, say 50 degrees, it has to do that to keep from freezing up. Normally a very good AC can drop the temp 15-20 deg which means the evaporator can freeze. Recirculate mode may even make it worse.
    ericstewart's Avatar
    ericstewart Posts: 13, Reputation: 1
    New Member
    		  
    #3

    Nov 13, 2007, 05:54 PM
    Comment on KISS's post
    Very helpful
    CaptainRich's Avatar
    CaptainRich Posts: 4,492, Reputation: 537
    Cars & Trucks Expert
    		  
    #4

    Nov 13, 2007, 06:09 PM
    For many years now, engineers and programmers have known that with most vehicle cabins built with better seals, short cycling the A/C compressor during Defrost mode can greatly reduce the amount of moisture inside the vehicle's cabin, thus clearing the windows more effectively.
    With most vehicles built in temp sensing measures, freeze-up has pretty much been eliminated during cold weather.
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