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I run a Dodge 440 that runs normal temp until recently. I have a new thermostat and fluid in the radiator that has been driven less than a thousand miles. When I was going up 101 north with some hills to climb and being hot outside the temp would rise alot. It does however go back to normal under no stress driving.
Check EGR valve. I had this problem and thought it was my rad. I had to replace the EGR valve and now when I tow up-hill my temp gauge stays where it should.
Under heavy loads, all engines will produce more heat. Your radiator may be partially clogged with calcium deposits, or your fan could be starting to fail. There is no one fix that fixes all overheating problems. How old is youe vehicle? Has any other work been done to it lately? When you were climbing up the hills on 101 was the temperature outside 101 also?
79 I have flushed the radiator and put in a new thermostat. I also put in a new fan clutch. It does have a trans cooler also. Yes it was over 100 degrees outside and that might have made it more difficult on the engine.
Right after I did all that it stayed running pretty cool no matter where I was driving. Now I'm wondering is there anything else.
Thanks for your input.
I had the same problem on my 413 Dodge engine. I got tired of trying to fix the problem and treated the symptons by hooking up a water spray from the fresh water tank so it would spray on the radiator in uphill situations. I didn't have any problem after using this method for about 4 years.
Running the heater helps if you can stand the temperature.