Join Date: Jan 2009
Location: Round Rock,tx
Bronco Info: 1955 Ford F100 body on a 1979 Bronco chassis with a 351M
Temp gauge moves hotter going down highway
I have flushed the system, ran a system cleaner for a week, about to replace the water pump due to weep hole leak, new radiator cap, new 195 thermostat, according to the electric aftermarket gauge the temp is around 200-205 degrees when warmed up if you keep it under 50 mph once you hit 60-70 mph the gauge moves to 207-209. The gauge only has a 180 and 210 mark so I am guessing on the exact temps. It has two electric fans on the radiator and no clutch fan which appears to keep the temp under control at idle. Is this in normal range for the temp to rise at highway speeds? everything I know tells me it would rise at idle but this is not the case. I am wondering if the gauge is off because when I check the block with a infrared thermometer the temps are closer to 185-195 degrees nothing appears over 200 degrees. The gauge also is very sensitive because you can actually watch it move as the truck heats up and cools off. I am just a little concerned since I recently bought this truck and fixed a blown head gasket. There was another electric fan on the motor side of the radiator that was not working so I took it off. I dont think the fan would matter at highway speeds. Please enlighten me if the extra fan will help, or if I might have other issues or am I just overconcerned? I am having no other issues otherwise.
What has me puzzled is the rise in temp at highway speeds.
Thanks in advance !!