273 Overheating

Never knew that about the "circulating too fast" bit.

I back flushed the entire system, back flushed the engine & radiator separately, ran flush chemicals through the system. (didn't get anything but clean water out each time. Water flows through the radiator as fast as you can pour or pump it in.

Radiator seems to be an even temperature across the cores (by touch, can't find my infrared gun to check core/inlet/outlet temps).

Mechanical Gauge reads 225* (and will continue to slowly climb if you let it run)

Electrical (Factory) Gauge reads Pegged as far as it'll go.

Digital Thermometer/Probe measures 215* when stuck into the fitting for the mechanical gauge (I dunno if a 10* difference is a flaw/inaccuracy with one of them, or if it's the difference between actual coolant temp and a measurement taken from the other side of the brass fitting).


Note : I'm not a brave enough man to use that Digital Probe to measure the Inlet & Outlet Temp on the Radiator while the engine is running, since the fan blades are only about 3/4" away from the Inlet & Outlet.


Like I said, it'll continue to climb in temperature, but doesn't seem to boil over.


Leakdown Test showed nothing, head gaskets seem to still be holding on for dear life. Pressurized the cooling system, it held 20psi for 6 hours, without dropping so much as 1psi.


I'm about ready to just say screw it and run it to see if it'll stop rising after 230-235* Normally I shut it down, fearing engine damage if it climbs any higher.