[Fixittt]

I have one suggestion for you that has nothing to do with temps, but more that eye candy factor.

1. cut the plastic slower. take your time. It will look better.
2. Drill slower. The hole that the pumps power cord goes thrue is starting to crack. I would drill it out, but slower and use coolant.

3. what every one else had said. The heater core is being wasted. If it were me doint it. I would take a hole saw and drill out the 4 corners where the heater core would fit. Line it up so that the OD will make rounded corners for your cut out. Then take a jig saw with a 2x4 clamped to the plexy as a straight edge. Then connect the 4 holes. It will make a nice straight cut, with nice rounded corners. And still give you plenty of plastic if you needed to bolt the heater core to the plastic. Also I would use some weather stripping (Foam with tape on the back) and place it between the heatercore and the plastic. Just to keep the vibrations down. So it doesnt resonate thrue the plastic box.



Looks good.