I had my 2006 grand prix fix 3 times for the tempature gage and stilss the gage goes over the 3 line

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Firing order: 1-2-3-4-5-6 Distributorless ignition system.

Diagrams of the firing order and videos for setting up the coil packs.

https://www.google.com/search?q=2006+pontiac+grand+prix+3.8+firing+order

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get your car fix right now
Pontiac Grand Prix 2006 Owners Manual Download

Water pump may be bad,

remove thermostsat,drill 1/8 hole close to edge,to by-pass steam,common problem....jack-up the front of car toallow any air to purge from system,should be bleeder valve...bolt with a nut...loosen it remove air until antifreeze runs out,retighten bleeder nut,,put car back down....should fix ya

you will need a scan tool, that hooks to your cars computer..to diagnois....

check your coolent .if your coolent is low you wont get any heat try this frist

sounds like you need new fuel pump. fuel pump located in gas tank. before you go buy a new fuel pump first push up and down on trunk of car real hard to try to dislodge the little armature inside of tank. this little armature is what sends the signal to the gauge telling you the quantity. push up and down on truck to try to dislodge small signal armature then check your quantity. try this when you are having the problem and i am willing to bet the little armature is stuck. the only way to fix is to buy a new pump.

I have 19897 Grad Prix that the RPM gage wont work, only some time, i perchesed a manul for the car but is dont tell me squat about RPM gage

At around 200^ or little less195^ while driving, ac on idling in traffic will read hotter but out of red, note should change thermo stat if over heated I hope I was Helpfull

Try disconnecting the battery for a minute. If that doesn't straighten it out, you may have to take it apart again. The float might be hung up on something. It may shake itself straight next time you put gas in, too.