Your fridge working in elec is great. Means the gas side prob is minor. There is a indicator that lets you know the pilot light is going. You have to open the fridge door and to the far left of the knobs there is a small shiny metal looking piece in a small cut out. When you hit the stricker you will see the metal thing shine for a second that lets you know the pilot is going. If there is air in the gas line I turn on the stove top to purge out any trapped air to expedite the process. Im not sure what the % it has to be within level. You might want to take the vent cover off to get to the pilot and look at the flame, There will be a screw around a small metal box cover to take off. The pilot flame should be blue not orange, if its working right you can barely see it. I just bought my rv and there was a lot of road dirt on the coil to wash off. If it is real hot outside it will take the fridge a lot longer to cool down. Another thing you can do is get a fan like the kind used on a computer and wire it in to push either cool air to the lower coil or hot air out thru the roof vent. The rv store sells a small battery operated rv fan to work on the inside to circulate air.