1999 Porsche 911 Questions

All 1999 Porsche 911 Questions

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The mechanic did not tighten the cap on the coolant tank, hot coolant, steam came out, runs all over the place, and now my car runs really bad, it want start. Can you explain what happen?
I have changed out the battery and the top opens and al other functions of the car work, but the windows will not close or open fully or the car will not start( No noise what so ever)
car has 145000 miles. recently alarm malfunctioning and emitting lite on dash not appearing at all.
When the door is open, the inside light plus the light at the bottom of that door should come on. They do not. The same on the other door. The inside light does not work via the toggle switch either. The bulbs are all...
Let me start by saying that the volt meter in car spiked at over 16 volts. at this time lighter works, red light on radio works but nothing else. Checked all fuses all look good. Anyone have any other ideas??? Worried...
I love my car but I can't take the road noise. Whats the best way ti deaden the noise? I've heard of getting it undercoated and then someone else stated to but dynamat down in the back???
When I push on the brake pedal it seems to lock up??? If I hit them hard they don't stick but if I just push down they slam you to the dash. Checked the lines and has good vacuum. any ideas??