Will a home ac compressor run with out freon?

I'm having problems with my A/C unit. A service technician came to My house, looked at the compressor unit, and told me the panels Were full of debris that he couldn't accurately measure the freon Pressure. He asked to clean the panel for $89, which did not Include the service call, another ...

I have been out of the business for 20 yrs and I didn't keep any of my books on A/C. For a 3 and one half ton central air heat pump (Trane) totally evacuated system about how many pounds of Freon will it take. I am talking pounds by a scale from a 30 lb can of R22. Depending on the outside temp...

The outside ac unit is working but the hose was not cool or had any condensation on it. I was told that was a sign of needing Freon. The house was cool until early morning hours and was really hot all day even with the unit running. If the inside unit works then, why else would the house be so hot...

I know nothing about cars.. The a/c on my 03 corolla blows hot air, it has freon and the compressor works.. What else could it be.. Help.. Thanks

This board is awesome. I have done some reading first on here. Here's my case: Compr runs fine. Fan on HVAC blower inside runs only in Heat mode. Not on Cool. Not even on "FAN-ON" as opposed to FAN-AUTO. Can this be an issue with relay and board within HVAC? Per other thread, it was talking...