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When I turn on the ac I can see that the ac compressor clutch is engaging but there is no cold air at all. The low pressure port shows 30-40 psi with the ac on and blower on full speed.

Any ideas on what to check?
 

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Does the AC clutch cycle on and off?

What to check is the high side pressure with the low side pressure, low side pressure alone doesn't tell you enough to know what is going on.
 

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Sounds like the AC is working, Feel the AC lines in the engine compartment - one should be hot - the other cold - if so AC is working. Do you have a third seat Heat/AC? See if it works as it uses the same AC compressor and Freon. I'd check for a blend door problem. Check all fuses?? easy to do.
 
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