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Sully, the HHR fan is what I use, as well as a few other members. I think I got mine for around that same price. I also use the SPAL controller. Let me find my write up on installation for a 3.7L and I will post it up.
My HHR fan is awesome. Perfect fit, quiet, and i could feel the extra HP the moment i installed the fan. It was 110 here today with the ac on full blast and in traffic with the 195 degree factory thermostat, the temp gauge never went over 1/2.
That will be perfect. The sensor will thread into to empty port on the upper water outlet. The install took me a total of 1.5 hrs including a run to the parts store.
Nah, thats way more than you need, just go to Advance Auto Parts or something similar, just take your Spal Controller wire harness with you and they can match a temp sensor to it that cost like $6 and works just the same.