engine over heating

Depending on the age of the radiator, it could have blockage that is not cleared by the flush. that happened to one of our cars, we chased an overheating problem, not looking at the radiator any more because the radiator shop was supposed to have rod'ed it out. Turns out they had not, which we learned when we took it back out again, to another shop, it was discovered to be very badly blocked. Not a mechanic, just an experience I've had.

I have been having the exact same problem and tried ever trick suggested available, but found the absolute Cure !!!! Remove the thermostat and flush the system then drain and flush with fresh water while the truck is running and the drain cock completely open. remove the heater hose on the left side of the engine while facing the engine, you will find a crush clamp on the top of the bend carefully use a small flat screwdriver, insert it in the slot and rock it back and forth several times until it becomes free enough to remove from the hose. Take apeice of heavy wire such as 3/16 tig wire and make very slight hook on the end, slide it down the hose though the flow restrictor and pull the restrictor completely out and trash it !!!! Replace the hose to the original connector then take the thermostat and clip off the little bronze colored piece that rattles freely and discard. when your replace the thermostat while facing the engine make sure the opening from the piece you just cut off is in the 2 o'clock position, replace rubber gasket anti-seize the bolts and tighten. Now try and have the front of the truck on a 20 degree angle up and fill with fresh anti-freeze, drive the truck for 5 to 10 miles then open the hood and very carefully and slowly open the expansion tank cap and you will hear air bubbles moving, when that stops tighten the cap. you may notice a very small amount of anti-freeze the first time but your problem should be solved !!!! I have had NO adverse effects whatsoever, the heater produces heat faster, the temp gauge stops at the normal temp and when the temp dial is in the cool position the temp is the same as outside the truck !!!! I am not a Automotive expert but I am a Plumbing Heating contractor and understand hydroponic better than most and the effect of thermostatically actuated valves and took my time to figure it out !!!! I Hope this helps others it sure has saved me from wasting money on coolants and frustration !!!! Booty