The HHR fans take a bit of hacking for tighter engine compartments and don't fit the radiator well.
The Mercedes C-class fan is a near perfect fit and flows MUCH more air.
Read this thread.

Mercedes fan on (damaged) 26" radiator:



Mercedes fan (WRONG STYLE but same size) on aftermarket radiator:



HHR fan on the same radiator:



Be sure you get the correct style Mercedes fan! The early style is on top. It's commonly found in the aftermarket. You need the fan on the bottom without the heat sink.


We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon