My passenger side power seat won't move forward or backwards Everything else works fine. Also, my external temperature is fluctuating - ex- it will read 30 outside when it is really 70. Do you think this is a sensor problem?

If they are power seats, there is a small cable the drives the track from the motor under the seat. It is possible that the cable has come off on one side. But it is possible the seat track is broken and will require replacement.

check the switch for continuity if no change the switch

Check that the seat belt mount (often solid plastic or metal that holds the button side of the belt in place next to the center console) is not pinching and preventing the seat from moving forward and back. This happens on many Fords, so it might happen on some GM's too.
If you can hold the buckle mount out of the way while someone else moves the seat backward (or forward), it usually starts working OK again until someone moves the seat to the max forward or max backward position and it gets stuck again

try to look under the seat for coins that have fallen down and got stuck in the track. it happened to mine!

Check for a blowin fuse, Defective relay, Loose wires break in one of the wires, Switch could be shot, OR evan the motor has burn,t out,

Before you do any of the expensive things disconnect and reconnect the wiring to the seat I had the same exact problem with my 2009 Chevy Impala and was ready to take it to the dealer when I disconnected the power cables to it and reconnected them I found that one of the Harnesses was loose and the problem was solved

seat motor is no good and needs replaced if switch is working in each position

So here is a diagram of the seat circuitry for your car. Since every other function works except the forward/backward slide function, that leaves basically the forward/backward slide motor, the seat switch, and/or the wiring. If you can verify that the wiring under the seat is in good condition without obstructions, chaffed wires, and/or wires pulled too tight, then it's safe to say it's down to just the motor and/or the switch. Sometimes if the passengers front seat has the same switch, you can plug it in to the drivers' side connector and see what works and what doesn't. If the seat works fine with the other switch, then that's all it needs, if not then it will need a motor. If the other seat doesn't have a switch then you can find them at wrecking yards, or just supply power and ground to the motor in question to see if it works. If it does, then you know you kneed a switch and if not then a motor.
I hope this info helps!~subyguru~

the wirering for the drivers seat will have a wireing harness under the carpet this is the best way to tap into power for the seat

Good day;
What year is you car? Does the other controls work for the seat? and just to clarify the seat won't go forward of back?


Cheers