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Hi guys,
It's been a while since I've been back on here and I have scoured the internet to the best of my ability to diagnose my problem.

Here goes:
2004 Base Impala
95k miles

This is the email I sent to my dad:
I took it to Express Lune and the mechanic had filled up the coolant system with water and eventually the heater began to work again. He stated that there wasn't enough water getting to the heating core for it to work making it over heat. Makes sense because now it blows hot air.
I would not use water since it boils at 100C or 212F and would overheat quickly and water freeze at 32F so you could crack the engine block and or damage other things

most car engines run at 160 to 200 range

Fine if your running a steam engine.

*Oh, also my radio likes to stay on after the car is turned off and key is removed. Any reason why?
should turn off when your open the door

P0620 - Generator Control Circuit Malfunction
Possible causes
- Failed Generator/Belt
- Battery charge
- PCM controlled generator
- PCM failure
- Open or short generator circuit

P1811 - Transmission 4-Wheel Drive Low Indicator Short Circuit To Ground

P0300 - Cylinder Misfire Detected Random Cylinders
- Faulty spark plug (s)
- Faulty ignition coil (s)
- Clogged or faulty fuel injector (s)
- Intake air leak
- Fuel injectors harness is open or shorted
- Fuel Injectors circuit poor electrical connection
- Ignition coils harness is open or shorted
- Ignition coils circuit poor electrical connection
- Insufficient cylinders compression
- Incorrect fuel pressure

P0455 - Evaporative Emission Control System Leak Detected Gross Leak
Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
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