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I have a 1995 ford f350 with a 460. My temperature gauge would fluctuate from hot to normal. So I changed the thermostat, the water pump and the radiator. The problem stayed the same. Than I changed the temperature gauge from my race car to the truck to see what the temp would be. It runs from 210 to 280 and boils over then cools down then gets hot again.
Any advise??
Please help
maybe your not getting all the air out of the water jackets in the engine. ran into that on a foriegn car had to losen the heater hose to bleed it. took in a lot more water heard that is common now in newer model vehicles
You can also have a defective thermostat,even if it is new.
That hapened to me. New thermostat, had issues getting to temp. Decided to check it and it was stuck open. When you get a thermostat pay for the higher dollar ones.
How about the A/C condenser in front of the radiator - is it possibly blocking airflow (as in chock-full of dead insects on the front side)?
Another possibility is retarded ignition timing and/or a lean air-fuel mixture - these can cause engine overheating as well.
You might try adding some water-wetter to your coolant (they have it at most GOOD auto parts stores) - it increases the transfer of heat from the engine block to the coolant. At this point it can't hurt anything.
I remember fighting this same issue with my dad's 1977 Lincoln Town Car with a 460. It ran too hot no matter what we did with it (dumped a lot of $$ into the same stuff that you already have, with no real improvements), and in the end we just lived with it (it was a third car that only saw occasional vacation-trip use).