I'll add that for those considering a serpentine swap, 97+ with dual thermostats won't bolt up unless you modify the throttle cable bracket, and also replace the metal return line that crosses front of engine. Unless you get the super rare single thermostat housing from late 96 (late 96 started going to the 97 style, but without the dual thermostats.) An earlier style thermostat won't fit without modification to the 97+ system either.
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