Just received and installed my new Dometic CFX3 IM. Place in the back of my 2008 Jeep Wrangler JKU. Plugged into cigarette lighter via included cable. Filled refrigerator with 24 chilled bottles of water and went for a drive.
2.5 hours later temperatures in fridge does not want to get below 37 degrees F. Parked Jeep overnight and apparently the power shut off the fridge at 12.2 volts (medium setting)
Started the Jeep, no problem fridge turned back on automatically and displayed a temperature of 39 degrees within about 15 minutes. Still unable to get fridge below 37 after several hours.
Jeep is parked in driveway on slight grade outside temp 70 degrees. Am I doing something wrong?
Try running it on AC power over night because any of these fridges will take quite a while to drop down to a low temp also if it has a boost mode then run that for a few hours,
Like all fridges they don't like being filled up with a whole load of items all around room temp, IE If you had it 2/3 full and it was running at your set temp and then you filled it right up with room temp Items it can take a few hours to bring the new contents down to match the temp of the stuff that was already in there, Not only that it also has the cool down the warmer Air that got in there while you had the lid open, EVEN a house fridge or freezer can take up to 12 or 24 hours + to bring the contents down to match the other goods that were already in there.
They are very fast at cooling when they are empty or when they have just a couple of things in there but if you cool it right down and then add a heap of stuff in there it can take a long while to bring it down to the desired temp even more so if you are trying to take it down from room temp down top -12*c or-18*c /0*f ,,, Ok.
Hope that helps,
EDIT:- Also note that anything you put in there that is in plastic containers with Air Gaps in them will make a fridge cycle "ON" longer and it will run more on and off cycles per 24 hours, But fill it up with Cans of Coke or Beer and it will Cycle On for about the same amount of time maybe less but It's OFF Cycle will be longer Sometimes up to 2 or 3 hours because the metal Can's hold the Cold a lot longer which will reduce the amount of On and Off Cycles it does per 24 hours, Because all Metals conduct the Cold.
HOT TIP, If you drink Soda's Coke or Dr Pepper or Beer, Place a layer of Cans in the Bottom and they will hold the Cold longer making the fridge use less power, I have tested a lot of fridges for months at a time and one of them has been running over 2 years non stop and the Layer of Cans can save you up to 40%+ of the normal power draw, Ok, Good Luck. and give it a go and see what happens.
