Hi bro....
sry for the late reply. this is what I have gathered. the front is warm, there is no wind coming out from the rear.
--> For resun model, there should be wind at the rear because the design is using fan located at the front suck and blow out from the back...
the fan sound can be heard. heard arh.
--> You can use a single tissue paper, place in front, see whether it will stick at the front air inlet.
--> if the tissue not stick, meaning your fan is not strong enough or the front filter too dirty block by dust.
why is the meter showing 35 degrees? haha. the chiller about 1 year + .
--> is this a real temperature measure from your tank?
--> can confirm using external thermometer?
--> if at 35deg, is a big issue....
--> does this reading drop when the chiller kicks in?