Question about 1990 Mitsubishi Montero

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A/C blowing hot air while driving

I have a 1990 Mitsubishi Montero. I have recently replaced the A/C compressor, drier and expansion valve. Everything works great as long as I am sitting still. For instance, at red lights and at a parked location, it blows cold. However, when I am driving, the air starts to blow rather warm. I know my freon level is good, fans are working and car is not running hot. Any ideas of what the problem could be? Any help is so greatly appreciated.

Thanks,
Chad

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  • blksunshine May 22, 2009

    I am assuming this is how I respond.



    Anyway, the pressure is around 30lbs.



    I forgot to add, I also retrofitted everything to R134....



    Thanks,

    Chad

  • yadayada
    yadayada May 11, 2010

    DID U ADJUST THE SYSTEM CHARGE FOR THE R134, IT TAKES LESS (80% AS MUCH) THAN R12, IT WAS IN THE INSTRUCTIONS.

  • yadayada
    yadayada May 11, 2010

    what are the pressure readings?

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Could be a vacuum line is busted. When you apply brakes it provides pressure to the system for freon to move and blow cold. Without that forced pressure freons not moving. I had that problem with a ford f150 and finding the busted vacuum line fixed it. It may be different with a mitsubishi, ask a local mechanic

Posted on Oct 08, 2009

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