Originally Posted by Ali112
thanks guys their is some sound from the fan when it ran so fast when the temperature exceed 220,am wondering on idle the temperature exceed 220 especially when i drive in very low speed with tough steering and normal temperature on high way,i hope change the fluid will give us a good change.
220 on a 4.7HO you sir are going to start saving now. the 4.7 does not take kindly to being overheated. operating temp is 210 the fan is supposed to kick High on at 215 i believe? have you checked the thermostat?
you could have air in your coolant system also.
Does your also have the Electric fan? the relay could be bad on that because that's supposed to kick on at 215 if you have it
the Hydraulic fan is also one Expensive! piece also like $500+ and getting rarer to find.
In all seriousness watch the temp on the 4.7 she has aluminum heads.
she isn't like the all iron 4.0L furnace.