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Mercedes-Benz E430 Questions

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Especially on hot days.
i' ve read it can be a regulator or resistor can the regulator be taken out and the points cleaned if so i would appreciate some info as to how to do this and if a video is available thank you
When we turned the AC to cool this morning, only warm air was blowing. I tried to charge the unit but the pressure on my gauge started climing up to 100. I shut the motor and the freon tank valve and left the connector attached to the low pressure valve. The "dead" pressure stayed at 70 lbs. If this too high I intend to bleed some of the freon, But how much to bleed
One day it worked. The next it did not. The defroster does not have any air coming out and the fan vents do not have any air coming out. But, you can hear the fan. And, on A/C the fan blows cold air.
I never turn the radio on, yet it turns on by itself. Even when I manually turn it off while driving or not, it turns itself on and won't stay off.
My key won't turn or make the click noise when I insert the key.
Does anybody know what may be the problem?
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