2007 Buick Lucerne Questions

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At speed, (2007 Lucerne) when I go into passing gear via foot petal their is chatter from the engine compartment. Only happens then so can't check it out. What do you think? Water pump....fan.....internal engine......
This sound is non-stop with door closed & quits when it is opened. Only the driver's door is affected. The car has been shut off for over 20 hours & is still buzzing when I open any door but driver's. Please help this...
Seems as if oil smell is coming from under the car
It gets louder the faster you go and stops when turning to the right. It sounds like when your gears don't change but that's not what it is.
does anybody know how long it takes to replace a bad injector valve for the secondary air system that puts air in the exhaust when the engine is first started, the valve is at the back off the engine (3.8) we found t...
the valve is not working right so i am getting it replaced, and wondering how long will this will take the mechanic we have the valve already so its just the time involved .
changed resistor and blower motor but fan still won't run
how do you get the bad bulb out? how do you get in the light assembly to get the bulb out?