At least you are located in Calif. In colder States such as Minnesota, Washington, Ore. Idaho, I would say NO. but should be ok in Calif. Drive and see what happens if anything, go from there.
You cannot change the fan setting on the 5.7 hemi only on the 6.1 hemi. it will keep engine cool but once you sit in traffic it will go up to 215 217 then go back to 180 185. I had one on my Hemi did not help at all I got worse gas mpg stay stock.
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