1999 Cadillac DeVille Questions

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i just got the water pump and thermostat replaced, im losing a lot of coolant and have to keep refilling the radiator with coolant. my car is still overheating the temp gets up to 260 which is incredibly bad and i don...
change the temperature settings 65 to 90 degrees it starts making a crackling noise like the vents are getting stuck.
I was noticing that every 2 or 3 days my battery would be dead upon startup. I would jump it off and car would drive as normal. I then did the meter test and found that the RSS (road sensing suspension) fuse in the t...
I have recently noticed the ride quality being stiffer and I feel the road more.....even though I hear the air pump for the level ride come on and turn off after starting the car....is there a sensor that needs replac...
Just bought the car and it over heated driving 50 miles home. I assume it is the northstar head gasket issue discussed here.
I constantly have to put in antifreeze, I took it to my Mechanic they replaced the thermostat. It still overheated brought it back and they tested it and said the head gasket was leaking and needed to be replaced cost...
Get into obd2 code
The security light on top of the dashboard flashed. My mechanic says I need some code or type of response to get the car to start again. What is the code and process to get the car to start after changing the battery?
Soon after i put in the new radiator the car was overheating. I was able to drive it about 10 or 15 minutes before it would get hot. But i mostly used it for an in town car anyway. What could be wrong with it if it ha...