the title pretty much says it all. does anyone know how to activate
it? i know this is a pretty dumb question but im new to it

2002 Malibu 3.1 V6 auto - not every time but happening more often
since the weather got up to around 80 - under heavy throttle, in
second gear only, the engine will start surging badly when the engine
gets over 4500 RPMs. Plugs and fuel filter have been changed.

I am having a problem with a hole in the firewall. It has nothing to
do with the heater core as I can account for both the inlet and outlet
hoses from that. It is a hole about the size of nickel and water
drains out of it. The car came that way and I am wondering what this

Working on a friend's 2001 malibu.
Is low on freon.  Trying to add more, but A/C compressor won't kick
on.
Where on the car is the low pressure a/c switch?  I've looked all over