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Hey guys i have a 2003 pontiac vibe that i am working on doing some ac work to….. the complain is hot air out of the vents so to verify the complaint i started the car and sure enough, the air is hot…i hooked up a set of manifold guages and reading pressures of 100 psi on both high and low side…compressor is not kicking on….where should i start? the green light comes on when you press the ac button and the motor slightly revs but have no compressor action at all….
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First thing you need to do is to properly recover all the refrigerant from the system. At this time I would personally replace all O rings and seals in the system and install a new Receiver/Drier or Accumulator depending on what you have. Then you need to vacuum the air out of the system as close to -30 hg as you can get (probably take about an hour) then see if it will stay there after you turn off the vacuum pump and remove it from the service hose. If it holds the vacuum for 30 – 60 minutes without any loss of vacuum you can weigh the proper refrigerant charge (using a scale) for the vehicle and allow the vacuum you have created to bring the refrigerant into the system via the service hose (yellow) and through the low side of the system (The gauge valve for the high side (red) should be turned off until the full charge has been added). You probably will not be able to get the full amount of the weight of the refrigerant that the system requires just with the vacuum alone so after you get all that you can of the weighed charge in with the vacuum start the vehicle and turn on the A/C to high. The compressor clutch should engage and should be able to draw the rest of the weighed refrigerant into the system. Stop the adding of refrigerant when the scale indicates that amount of the weighed refrigerant is in the system. If all the seals and O rings are good and none of the other system parts are leaking or plugged up, You should have cold air coming out the vents.
Lots more A/C info in the “How To” Forum here on pages 1 & 2
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