Question about 2003 Chevrolet Impala

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Hi, I have a 2003 Chevy Impala, which has a problem with the A/C. If I run the fan w/o a/c, it blows in air at the outside temperature. If I switch on the a/c, it blows in hot air. I took the car to Midas and they charged me $350 to replace the O-rings, which they said were causing a leak. The a/c ran fine for about a month after that, but now it's again gone dead. I checked the a/c fuse (10A fuse) and it was burnt out. I replace the a/c fuse, but the a/c still doesn't work. I know it's tough with the information that I have been able to give you, but could you kind of point me towards a possible source of the problem? I would like to have some idea myself before I go into a repair shop again. Thank you, Sid

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This is tough to do online and without special tools. There is a leak somewhere and it takes special tools to find it.
1. First a manifolld gauge has to be installed on the system and pressure readings are taken to see if any coolant is still there.
2. If there is coolant (freon) in the system then it can be checked using a leak detector that is run along the lines and connections. There are connections at the Condensor, compressor, evaporator and drier/orifice tube.
3. If not leak is found or there is no pressure in the system then it has to be evacuated using a vacuum pump.The drier should be replaced at this time and the whole system flushed. This takes hours.
4. Refrigerant is then put back into the system and it is checked for leaks and performance.

When midas replaced the ORings, that is pretty open to interpretation. They might have been talking about the ones that are on the connections. But there are other ones that could be causing the leak. There are two switches in the system that have to seal, there are rings IN the compressor shaft assebmly. IF the system sat idle for a while then you might have corrosion present from moisture.

Posted on Jun 01, 2010

  • Sid76 Jun 01, 2010

    Hi,

    The O-ring that was replaced is right behind the 'E' in this figure http://www.diymyride.com/wp-content/uplo... I realize it's tough to troubleshoot this kind of a problem online and with someone like myself who has very little practical knowledge about this. :)

    I'll get one of the DIY kits to check for A/C leaks and try it out on my car today evening. What could cause the fuse to burn out, though?

    Regards
    Sid


  • Sid76 Jun 01, 2010

    I forgot to add - the car runs everyday, hasn't been idle since I bought it 3 years back. It's been running fine, except for a leak in the intake manifold of the coolant reserve (guess that's a common problem with the 03-05 Impalas). I don't mind taking the car to a mechanic, but I would like to have a fair idea of what's wrong before I do that.

    Regards
    Sid


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