Question about 2006 Dodge Ram 2500

1 Answer

A/C compressor won't turn on

I'm sure it is low on freon but how do you get the compressor to start to add freon?
before you could jump the pressure switch to make come on so you can add is there a way to make compressor start?
2006 dodge 2500 50,000 miles bought it new in 06 never has been worked on or charged up drove it this weekend w/o air

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  • 2 more comments 
  • Mike Pierce Apr 28, 2010

    It is a 2006 megacab Diesel Dodge

    don't use it alot drove it 2 weeks ago and a/c was somewhat cold compressor cycled alot

    drove it this weekend a/c not blowing cold at all (compressor not starting)

    use to on older cars you could jump the low coolant switch and make the compressor start and then add freon can't find it on this model must be ECM controlled? I have owned this truck seen new only has 50,000 miles on it never been charged or never been to shop at all

    have stuck a recharge bottle on the system(low side) at evaparotor canaster has 150psi on the guage

    I read your remarks good Ideal .will take my can and put it in hot water to raise the pressure

    how much pressure can the can take?

  • Mike Pierce Apr 28, 2010


    Was driving threw Downtown Dallas

    Thats the Answer that i'm looking for

    where is this switch located ?

    i've looked for this because this is what you jumped on the older cars to make compesser run

    A local mechanic told me there was not one on my truck it is ECM controlled??

    I have looked for it and that is why I asked a mechanic

    if you have a Chilton or any Book that you use could you pass info on PLEASE where the location might be of the low pressure Switch


    I know the front seal might have leaked some pressure and compressor oil because of the dirt around pulley just want to fill to make it to the race track and Back

    Then let it sit anonther two weeks

  • Mike Pierce Apr 28, 2010

    Didn't get a answer where this switch is located on said Truck?

  • Mike Pierce Apr 28, 2010

    Questions where answered
    but should have read post better
    all i needed is where the swich was located
    but the willingness to help and did well!!
    i would give a 8 on a scale of 1 to 10



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  • Dodge Master
  • 78,254 Answers

To help u i need the model and year of the Dodge, they make lots of models and the instructions are different for each on, one generic method to help the gas flow in is to put it in hot tap water to create More gas pressure in the R134 can, try that and if that doesn'tr work then I need more info from you, also have u put a pressure gauge on this? if it shows about 40PSI then likely the system is full and u have another problem.

Posted on Apr 28, 2010

  • 5 more comments 
  • yadayada
    yadayada Apr 28, 2010

    hot tap water from the faucet is safe, about 130 F max, will increse the can pressure about 30 PSI

  • yadayada
    yadayada Apr 28, 2010

    this system should never leak, my 1993 dakota has never been charged and will flat freeze you out, u have a leak, it is most likely the ac compressor front shaft seal, suggest u put a sealer in the system..

  • yadayada
    yadayada Apr 28, 2010

    You may also bypass the compressor cycling switch (run a wire jumper across the connector) in the low side line, that is the bigger line, a picture of that switch is shown below.

  • yadayada
    yadayada Apr 28, 2010

    OK understand the reason, well I have given u the info to fill it if a low charge is the problem, I have answered all your questions quickly and correctly, could u please reward me for my time with a HELPFUL rating? Thanks

  • yadayada
    yadayada Apr 28, 2010


  • yadayada
    yadayada Apr 28, 2010


    You may also bypass the compressor cycling switch (run a wire jumper across the connector) in the low side line, that is the bigger line, a picture of that switch is shown below.

  • yadayada
    yadayada Apr 28, 2010

    thanks, did miss that in all the trees.



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