Originally Posted by
fusioncom
The truck limped into the coolant safe mode and I limped it home at about 40MPH for approx 7 miles.
This could have damaged the head gasket.
The wife has been complaining of poorer performance for a couple of months now, and I noticed it the other day. The truck almost refuses to rev past 4k and feels somewhat week even when it does.
The computer and sensors might be finding problem and is restricting the performance.
I replace the overflow tank, and thermostat and refilled with fluid. The truck still overheats...buts its hit and miss I can drive it for 10 minutes with no problems, and then other times I can drive it for 5 and it overheats.
Did you bleed all of the air from the system? You may have an air pocket in the system that won't just go away. These trucks have the front and rear heaters which can hold a lot of air by themselves.
I noticed the leak at the front of the intake manifold the other day, but didnt suspect it was enough to cause the truck to overheat.
Any leak will cause an overheating problem if it is not contantly looked after by refilling the system and bleeding the air out. when the engine is at operating temp there is a pretty substantial pressure in the sytem that will force the coolent out at any weak point and as the pressure inside goes to zero it will allow air to enter the system.
I don't smell exhaust fumes in the overflow tank, but I did notice when the wrecker guy drove the truck onto the bed it was blowing some white smoke from the tail pipe, but someone else said its possible the intake is leaking some fluid into the combustion chamber. It cleared up after about 5 seconds.