Noise goes faster while car is driving.

So i know all about the Hold button and to not accidentally press it, but it seems as though every time I slam on the breaks too hard or something of that nature, the hold light starts blinking and my AC stops blowing cool air. It just blows air that's the temperature of the outside (which in Florida right now its like 95 degrees so I might as well drive an oven). ALSO my engine meter that tells you if your engine is cold or hot goes ALL the way down to below the Cold. Like the meter stops reading the engine entirely and doesn't move even if I drive it all day it says my engine is below the C mark. That also happens only when the hold light starts/cold AC stops together. Sometimes I was able to get it back to blowing cool air if I just shut off the AC and ran my car for a bit, drove around, I would happen to notice my Hold light shut off and my engine temperature would be back to usual (just below the middle), so I would go to turn my AC on and thank heavens it would be cold air!! But now this is day 2 and my hold light is still blinking, my engine meter is still below C, and my AC is still blowing hot air. It doesn't need to be recharged because i JUST had it at the shop about a month ago and got new wiring/spark plugs plus my Cold air was recharged. Any help? I really can't afford to take it to a shop right now but if I have to I will. This car gets me to work, after all.

This occurred after having my radiator hoses replaced. Not sure if related. Also occurred after filling up gas tank. Please help.

I pulled out wus getting on the interstate it when to shit to over drive and it cut out for a min like it wusnt getting gas

Ive checked all fuses no lights indicators are on it just cranks and thats all

at dealership 2 weeks later came on again but they would not touch it this time. Replaced fuel injectors at repair shop 1800 now a week later light came on again now the repair shop is telling me the converter needs to be replaced again at 2300. Any suggestions as still paying off the first repair? How long can it still be used with light on before it dies?

Start and I changed all my fuses

For a few months, key does not start engine 1st turn. But, only got stuck in engine on position twice in 3 months. Took to dealer. Quoted me $400 is this reasonable?

o2 sensor replaced and reading not ready for emission testing. drove car 150mls. took out last night for a drive cycle reset. hard to do where I live.

Instructions for installation