[Shotimes] 91 overheats in traffic

[van Oss]

My 91 overheats (or comes close) when driven in stop-and-go traffic.  I've
confirmed it's full of coolant, burped the system, and the fan comes on
during a KOEO test.  Even when I put the EATC in Max AC (which is supposed
to turn on the radiator fan), temp goes up when sitting still.

This SHO has 150K, new radiator and ECT a year ago, new water pump and hoses
three years (about 30K) ago.  Recently flushed.  The radiator fan is a used
unit, but it runs during KOEO.  All in all, the cooling system should be
sound.

This car has a Ted Breaux chip and 73mm MAF.  When the engine isn't
overheating, it runs like snot.  I just mention this because the LPM can
choose a fan-on temp.

VO