I have lost my user manual for my Engel MT45FP 40 L Portable Fridge/Freezer and I cannot get it to get cold

Depends on how often and long the unit is left open, rule of thumb, fridge 4 deg C, freezer - 18 deg C.

Empty fridge and if possible put steam down vent behind the cover in the freezer section. or hot water. it will com out in the fridge so be carefull. this unblocks the aif feed from the freezer to the fridge section. also make sure the fan is working.

when you crushed the cord you mite have shorted something else out so you mite have to call a technician out .

you should call the fixer immediately,it hamrmful to your freeze.

we see a lot of this have the thermostate replaced they cost around $40 us

check the cooler/freon/

i need a schematic diagram of a fridge

YOUR DEFROST TIMER OR A BURN OUT DEFROST ELEMENT

Check freezer... for Frost build up and if Fan is blowing, Check condenser... To make sure clean, and the fan is blowing (by compressor), Check recirclating Vents in refrigerator... to make sure theres no blockage, CONTROLS ...should be in the middle setting, YOU CAN TRY turning FREEZER CONTROL To A WARMER FREEZER SETTING Allowing.. MORE AIR.. to refrigertor side

if compressor is running, then you are correct in saying no point in replacing stat. by sounds of it you have a faulty compressor fault or a syatem fault - impossible to dignose by remotely. this is not a diy job i'm afraid