I have a 2001 mitsibushi magna and cant get the cigarette lighter to work,

Nowhere near enough information for me to figure out what you've done and what you need help with...

have to take dash apart use the outlet in the rear right end

The fuse for these items is the second one down in the right hand row in the fusebox down by the driver's feet. Swap the fuse with another one to check.

2001 Elantra, heat only comes thru when driving, other than that its always cool....why doesnt the heat come thru when Im idling?

i had the same problem it's a blue 15 Minnie fuse. it run's your clock and lighter also your mires.

It sounds like you have a bad charging cable for the GPS or the cable is overloading the cigarette lighter.

The cigarette lighter is designed for less power then a 12v power outlet.

Therefore it is easy to blow the fuse for the cigarette light if you install something that draws too much power.

There are 2 possible areas. 1 is the fuse box beside your left foot. 2 would be in the engine compatment on the right.

The fuse for the cigarette lighter is the 15 amp CIG fuse. According to my wiring book, the fuse box is either behind the console, passenger side for US cars, or under the dash, driver side.

Check behind the dash for loose wiring connections. Check for bulkhead connectors that could have possibly come partially apart. Check for any under dash grounds that are ready to break or have become frayed.