Overheat = 240+ - all the way to the red , Radiator cap burping or OOOOOOOOO noise.. hot water into overflow bottle, overflow bottle spills over,
Temp gauge is fine. the fan is a Higher RPM and actually flows more air than the stock one, the Fan shrouds and plastic air dam are fine and intact. the radiator is NEW, flows Awesome, Water pump is the correct Serpantine Reverse Rotation, with the 180* thermostat the thing boiled over in about 15-20 minutes from cold start with the 160* I get an extra 5 minutes ,
it used to stat right around 195 all the time, now its fine untill the thermostat opens and the cold radiator water gets heat up. then its a slow battle to overheat. I tend to turn the A/C on so it forces the fan to come on, this delays the process slightly, but still the temp climbs, I have set the timing with the Knock sensor plug removed so the ECM is not interfering with the adjustments. for the heck of it today I replaced the already new lower radiator hose just in case. and the spring thing inside the hose was fine and intact, the new one was also fine. still no go , I am at a loss.. for the **** of it I removed the intake to check for clogs in the ports and stuff, everything was fine and clean. new gaskets installed correctly, base timing set with the timing light (I know the marks are fine because the double roller timing chain is like new as the engine, less than 1200 miles on it. ) engine runs fine. no clicking or detonation, perfect idle and response. no leaks , No vacuume leaks. I am at a loss...
I did find though , that during the engine swap a wire that goes to temp sensor #3 in the passenger side head had been melted. this sensor controlls the fans. my book says the fan comes on at 215 for a TBI (mine) and 220-230 for a TPI. but regardless of anything, unless I have a hose blasting the radiator, it boils over, driving at 55 on the highway the wind cools it a little, but the temp creaps right back up and over to the red.
i'm lost.. hope you guys can help
Chris's 67 RS/SS,can be seen at http://www.67rs.com
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