Q&A

 Rookie

I have two problems with the car. The first one is a coolant issue. The engine overheated twice a couple of months ago and I replaced the thermostat to correct the problem which it did. Since then, I checked the coolant level a couple of time since then and found the coolant level in the radiator about one to one and a half inches low and added coolant. Prior to yesterday, I allowed the motor to partially heat up before installing the radiator cap and adding fluid if the level drops before installing the radiator cap. Yesterday I added fluid once again and installed the radiator cap before starting the motor. I started the motor and there was immediate pressure in the hoses. Does this mean the head gasket is leaking between the cylinders and the coolant system and requires replacement or is this normal when the engine is started?
The second one is the car will not start sometimes after sitting and the engine is cold. It will crank over and tries to fire but does not. This issue also started after the overheating condition. The plugs were removed and found to have an excessive amount of raw gasoline on the plugs so the motor was flooded. After removing the excess gasoline from the plugs and reinstalling them, the car starts and has run fine for a while. Is there a sensor that could be causing this or is it related to the first condition of overheating.

Thanks for your help.