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I agree with cbolt in that it sounds like the radiator needs to be rodded out. Usually if the temp rises in bumper to bumper but not at highway speeds then your fan clutch is too blame. I would take the radiator out and take it to a radiator shop to be cleaned out. Should set you back about $40 or less. While your in there change the thermostat for good measure. Also I HIGHLY suggest you get a 167*F thermostat instead of the regular 192*F. I run both of these thermostats in my 260's and then needle never moves once it reached the middle of the "N". You want to keep the PRV's (V6) engines as cold as possible since they are all aluminum and will warp at the first sign of over-heating. Although these engine were not known for their performance or toughness they can still run for a very long time if kept COLD and if the maintenance is done on-time. My 79 262C is about to hit 160K on the factory B27F and so far so good (even though the kid before me really treated the car and engine like S&#T). Good Luck with that PRV!!!
Sincerely,
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Julio Meza 1979 264GL B27F 124K --> BW55->M46, CLS, IPD Sway, 81+ Dash, Gauges, Next: FLATHOOD 1979 262C B27F 159K --> Restore Project w/Possible B21FT 1984 245DL 213K -->Wifemobile
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