Old Man with a Hat
- Jan 22, 2012
- Reaction score
- Pleasant Hill, CA
Thanks for your comments David. It is not unusual for temperatures in the Los Angeles area to significantly exceed 100F much of the summer months and hours of extended traffic driving with the standard radiators in our cars with a/c operating causes them to operate above about 210-215F using a 180F thermostat even with clean original cores and fluid fan drives that are also in good condition and shrouds present (actually the maximum temperature achieved doesn't really depend on the thermostat opening temperature choice). That won't necessarily cause the red light to come on but it is too high for my comfort. So I guess "overheating" depends on what the owner is willing to accept rather than whether the red light comes on at least in my case. I run an aftermarket gauge with actual temperatures so I really know what the coolant temperature is rather than just depend on my coolant light.
What brand gauge are you using? Is it accurate?
I ask because I stuck one on my rebuilt 390 when during the initial break in of the engine, two years ago, it seemed to be running very hot. The original Ford dash gauge is currently running at the half way mark before the engine was rebuilt. The aftermarket gauge is saying 225 degrees and it plumbed in the thermostat housing. I got suspicious and put a 300 degree thermometer into the radiator opening and get 195-200 degrees coming out of the engine. Clearly the aftermarket gauge is off by a wide margin.