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2000 Cadillac DeVille Questions

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When I try to start my Cadillac DeVille it will turn over but won't start unless I use starter fluid, my power Accessories don't work as well as my keyless entry
It keeps going off and on also says to check the charging system... happened yesterday and then after the mechanic could not find a problem it was fine.. but again today it did it.. it is a 2000... not problems starting it seems fine at first
How long have you had this problem? 2 days
Temperture gage goes from cold to extremely hot then air shuts off beca;use of the warning signal and radiatior still full of water. engine coolant warning says coolant is low after verifying level is full. I believe it sounds like a false warning giving computer false signals or I think it might be thurmostat. I really don't know, I'm not a mechanic and need help because I can't afford
a mechanic. Cadallic service is very expensive and I don't have it. Please Help.
What seems to make the problem better or worse? Better just shut engine off and let set a while and bring water level to normal
How long have you had this problem? A month
2000 deville base.
car will start but I have to keep my foot on the gas or it will cut off and is running at 350 rpm
After driving for 1 week in snow I noticed a noise when I pulled out of the garage, wld driving in the snow have anything to do with the noise?
This is all I know about the vehicle. Thanks
Where is the temperature coolant sensor located on a 2000 Cadillac DeVille North Star?
It's starts overheating when I drive but doesn't do it when ideling running for a hr with the heat on high. I just changed water pump, thermostat, upper hose, last month and the radiator was changed last yr. DID THE BLOCK AND HEADGASKET TEST. ALL WAS GOOD. ( I'm thinking the thermostat was put in wrong or could the radiator be clogged or that lower hose?) The fans come on and are working when they suppose too.
When I depress the brake it wasn't responding, checked the lines at the wheel, no flow of fluid
It seems to run out at hire speeds what can be the problem
Electronic Fuel gauge dosen't work and My car vibrates at high speeds
replaced fuel delivery assembly
But low battery light is coming on.
Alternator trouble? I may have to replace the battery also, correct?
I recently put in a blend door actuator and a new temperature sensor but the air on the driver side does not get cold. Passenger side immediately gets COLD. Driver side takes forever to get COOL. It does get COLD if I'm driving at night. I'm not showing a check engine light. I don't want to spend 150 on a blower module if I don't have to. Please advise.

Thanks
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