Question about 2006 Dodge Ram 2500

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The air works great when it works. Then all the sudden it quits cooling, the compressor shuts off, and dont come back on. It seems to happen when it gets above 75 outside.

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  • lacazejr Apr 27, 2010

    It does get really cold before it shuts off.I have checked the freon level and it is good. What would cause the high pressure switch to cut out other than a restriction? Could it just be faulty?



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You will have to look into this further but I wouldn't rule out a High Pressure Cut-off Switch in the AC system. One thing you might have on your side is Newer vehicles run R134a refrigerant which is not an Ozone depleter like R12. that makes things easier for you to replace with the help of your local auto parts store. You can get R134a and air conditioner condenser oil in One and it is easy for you to put in. So first off you might want to make sure you are not low on R134a/not too full either, if the system does not leak and is to proper proportion of R134a the I would look at the High pressure cut off switch. (does it get extra cold before shutting off?)

Posted on Apr 27, 2010

  • boggs1134 Apr 27, 2010

    Sounds Similar to the high pressure cut-off switch issue. The switch is to cycle the compressor on and off so as not to get Too cold and ice over. One test Carport mechanic test is to unplug the connector to the switch put a paper clip into the wire-harness end to make the connection that the switch would otherwise make. This Just A Test to see if it runs longer disconnected from the switch but with the connection being made with the paper clip or piece of wire. Caution the switch is to cycle the ac on and off so i doesn't get too cold. If the ac stays cold longer than with the switch plugged in as normal then I think you have found your culprit.... if it still stops blowing cold air, your looking toward the compressor (cycling?) and/or condenser..... Best of luck. Once again just a suggestion... if your not comfortable with any of these suggestions (don't do it!) keep asking, someone will confirm the best fix.


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A lil tip. when running A/C no need to run it on Full Cold, you will find that keeping it on 2 or 3 fan speed it will cool just as well, actually it works better. As for your problem try blowing out A/C and rad using AIR ( if possible) blowing from engine side out towards grille then rinse with garden hose,(low pressure water hose)

Posted on Apr 27, 2010

  • stepmckirgan Apr 27, 2010

    Sorry man not cetain just giving you a few suggestions. that condensor might be plugged.



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