Ok, 69 350ci. Pulled the timing cover to replace leaking crank seal. Original divider plate was toast, holes rust thru in 3 areas. Installed new plate, has appropriate distance to the impeller. While down I installed what i believe to be a cool mod. A 3000 cfm electric fan from a 97 v-8 Thunderbird, replacing a 15" flex and stock fan shroud. The electric fan and shroud fit our radiators almost perfect, little fabricating. Installed with relay and temperature control switch, comes on at 185deg and pulls alot more air than the flex and shroud. Problem i am having is the car overtemps at speeds when any fan shouldnt make a difference. I pull in the driveway at 220deg let it idle and the fan will bring it down to 200deg no problem and my engine thermometer reads 190deg. One thing I have tried to cure this is timing, 32 total adv, 16, 4. Nothing makes a diff. 160 deg thermostat,180 and no thermostat, No diff. Verified the thermostats are opening. It seems to me like a blockage somewhere. The lower rad hose is springed, upper is not. Rad is flowing, fairly new OEM 4 core. Also before, the engine never got over 205deg. Would air in the heater lines cause this? Only thing I did wrong from reading other post was I filled system complete with straight antifreeze, no 50/50. I pulled the pump off this AM to verify the divider plates sealed against the orings and the opening from timing cover tto the intake manifold was not blocked. Both checked out good. I doubt its a blown head gasket. Motor has been great along time, despite the leaks. And it does not have an engine mis or loss of power. Thanks, Any input, I appreciate.
