refrigerator

have a isotherm 85 litre refrigerator from webasco in my slide on its under warranty ,not happy at the moment,with temp control at 5 and a half ,19 degrees ambient ,it is plus 3.6 in the cabinet, at 35 degrees ambient,it is 8.2 in the cabinet, it should be less than 4 degrees,has just been fitted with an external vent,no improvement,at 250 dollars ,any further testing and no fault found , i have too pay at 125 dollars per hour. if fault found its on webasto.has any body had experiences with these refridgerators and can give advice.do not want to be left holding the can,if i turn the temp control up higher there is no advantage.thanks for future answers barry