2001 Cadillac DeVille Questions

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Just had new Brakes and rotors put on front of car week ago they were pulsating upon slowing down. Took to another mechanic and the tech said no issues I looked at him in dibeleif had same issue with rear brakes put new pads and rotors and they were okay so what do I do
Why does the light on the dash only come on at dark or when it's dark enough that my headlights auto turn on?
What seems to make the problem better or worse? great in daylight, Bad in dark cloudy sky or night.
How long have you had this problem? A month (ish)
I need to know to replace it or the price of the switch to be replaced
and they said it did not loose pressure and the compressor was working. They did not want to try to fix it because they were afraid they were going to have to take out the dash about 3days work
IVe don't two fuel treatments to it last week and it started without foot being on the gas and was drivable for a day or two. Then went right back to doing the same thing .
How to remove the heater core the easiest way from a Cadillac Deville 2001

Replaced water pump radiator and thermostat and the car still wants to run hot
already got new key,ignition turns over won't engage,dash lights like crazy possible ignition switch or antitheft system?
Still nothing is there a dyi video cuz I you tube and could not find the answer had the car for 3 yrs now first time this happen can you guys help? Thanks A lot for your time in advance
The car window comes down but it doesn't want to come back up
When my Cadillac gets 43 miles per hour it starts to run rough it loses power and its really sluggish I just had a new throttle positioning sensor put in and you EG R valve put in a new fuel pressure regulator put in a new fuel pump assembly and new fuel filter and a new catalytic converter why does my car start running rough when it hits 43 miles per hour
I just had a new throttle positioning sensor and new EGR valve and new fuel pressure regulator and new catalytic converter and new fuel pump assembly and a new fuel filter put on my 91 Cadillac DeVille but as soon as it hits 43 miles per hour it starts to run rough and shake a bit it's got no acceleration and very sluggish and it's using a lot of gas
Ignition switch wire colors and locations
Tried the key in door, nothing. Should & how do I reset the Security on car ? Car has done this twice before & after replacing starter relay was fine but now nothing, still won't start
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