Gilly, which fan do I remove and how? The car is typically driven on dry sunny days and has 52k. I dont imagine anything is too caked/crudded up but it's possible.

If it's not dirty, and you doubt it's the t-stat, what are the other possibilities?

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2004 Ram 2500 Cummins HO
2000 Jetta TDI
1999 E300 (sold)