Absorption fridges have been in commercial use since the 1920's
Folks blame cooling issues on the fridges when in fact majority of 'lack of cooling' problems are due to RV Mfgs NOT properly installing them USING the Fridge Mfgs 'Installation' requirements IE: Clearances/draft-airflow/dead air spaces etc.
Typically 'ZERO' inch clearances on sides/top/bottom and MAX of 2" on backside.
Baffles/fans are used to improve air flow/draft.
Air MUST flow up thru absorber tubes, across condenser fins and then exit out top area W/O any obstructions or dead air spaces.
Norcold and Dometic provide 'Installation' manuals for their various models.
Course if 'cooling unit' has already been damaged due to overheating issues from lack of airflow and/or off level operations then replacement is only cure at this point.