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Discussion Starter · #1 ·
I have a 2001 Sentra 1.8L. When I turn the air conditioner on I hear a hissing sound, like a vacuum leak, and the system will not blow cold air. It will only blow ambient temperature air. I have tried adding refrigerant, but the system barely takes it in. The air will get cooler, but not cold like it used to be. So, my question is, do I have a controls problem or a system problem? Vacuum leak not telling the system to function properly, or something else wrong with the mechanical system? Thanks!
 

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Discussion Starter · #7 ·
The compressor does not run when I turn the A/C on. This could be caused by low refrigerant, correct? If the refrigerant is low, then there must be a leak. If there is a leak, then it can be found with dye. If I can find it with dye, then I can cut down on the labor cost of troubleshooting to find the leak. I will try this.
 
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