Thanks much Gilly. Any idea where on the block the drain is, and is that necessary or should I just do the radiator?

Ive been noticing my car is warming up to temp a lot faster lately than it used to, and that its been getting slightly hotter than usual for this time of year. Think my coolant is just getting old or I have another prob? THanks!

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