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Econ button turns off the A/C but leave the climate control on (without A/C). The climate control will try to get to the set temperature but, obviously on hot days it never will without the A/C on. I use it during the winter and cooler temps, it saves gas not running the A/C, thus econ (economy).
If the freon level is ok, you have an electrical problem somewhere. The system will not activate because the control module "thinks" the freon level is low or because of another problem. It could be the module too. You'll need a shop manual to get the test procedures for climate control ac to check the components and circuits.
Check your vacuum pump located on the right side fenderwell. see if its running. Check the vacuum hose at the hubs for leaks or damage. repair if damaged. check for other vacuum leaks such as the grey hose going to the heater control valve.
ok could be one of 3 things. 1 you may be out of freon. (proly spelt that wrong) 2. compresser could be bad. 3 the clutch on your compresser might not be engaging. when trucks running turn ac on and see if the front of your compresser spins or not. if it does clutch is good. but it could be that your compresser is still bad. either way i recomend you go for freon and start there. when they fill it they will tell you for sure wether or not your compresser is bad.
This is called a switch pack. You need nimble fingers to remove it. There may be a blown bulb in the pack or just a loose connection. Look around for screws which may be holding it in. The bulb change is easy enough.