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At least 6 months ago my Saab trained mechanic (not an ac guy) was unsuccessful attempting to fix my ac. A couple days ago I came across the YouTube video. Could it be this simple?
How To Fix Car AC That Blows Hot - Possible Causes

 

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I had an issue where my A/C was blowing warm. Before taking it into the shop I tried a few things. I wanted to see if the clutch was engaging, so I pulled the relay and jumped 30 to 87 (you can see these on the relay itself relative to the fuse box, maybe fuse box too). You should hear a click, if you do, then you have at least seen that the clutch fires. You could replace the relay just in case and see if it helps.

Since mine was engaging and I replaced the relay, the next step was to check if I had refrigerant, which looks like it was really low. I ended up adding some and the A/C started blowing cold. Since the car is 16 years old, I didn't want to deal with buying a new compressor, so if that didn't help, i'd just go without A/C
 

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It could also be blend door servo, automatic control system, refrigerant level, bad pressure sensor, bad coil temp sensor, bad compressor coil, the list is quite large. Take it to a shop that repairs AC systems and let them isolate the issue between the HVAC system and the refrigerant system.
 
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