Question about 1986 Lincoln Town Car

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I just fix my ac in my 1986 Lincoln Town Car and charged it .i place the low pressure gauge to check my pull down and at temperature of around 84 degrees my low side give me a reading of 45psi is this good or what should the low side be at this temp?Should it be around 50 or better? I don't know for sure, I am using 134a in the system.Please give me and idea of what the pressure should be if the system is fully charged?

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  • Trevor Ross
    Trevor Ross Jul 30, 2009

    Thank you for your prompt reply. I evacuated the system from 12 and did all the right things. It is cold but I just wanted to know if the pressure I received on the low side was good for this temp .I am taking to Florida and I just wanted to be sure. I did not want to overcharged the system. Thank you CptTrevor

  • Trevor Ross
    Trevor Ross Jul 30, 2009

    I reply to him with a thank you for a fast reply and a very simple and uncomplicated answer.I was not sure since I do not work on these systems like before. But he clarify my position and I am good to go thanks again for a good reply CptTrevor

  • Trevor Ross
    Trevor Ross Jul 30, 2009

    I reply to him with a thank you for a fast reply and a very simple and uncomplicated answer.I was not sure since I do not work on these systems like before. But he clarify my position and I am good to go thanks again for a good reply CptTrevor

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Although there's no one benchmark for all systems, a low side pressure of 40-45psi is good. Overcharging will give the same symptoms of undercharging, a lack of chilled air. Overcharging will also do damage to the compressor. A good guideline for the high side pressure is 5X the low side pressure so a good high side would be in the 200-250psi range. If the system wasn't fully evacuated after the repair, a mixture of the old refrigerant R-12 and the new R-134A won't perform at all. Hope this answers your question. Please post back with any other questions you may have.
Greg

Posted on Jul 30, 2009

  • Greg Margossian
    Greg Margossian Jul 30, 2009

    Glad I could help. Best of luck on your trip and please remember to rate the solution I provided. Take care!

    Greg

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