mark392001

If EGR tube is broken it opens up into the intake which can cause high idle through vacuum loss. EGR tube runs along passenger side of engine down to exhaust manifold and connects to EGR valve which is left of the throttle body.

Warlockk

Check for exhaust gasses in the coolant. A bad head gasket will cause quick overheating. You may see bubbles in the radiator. And don't overlook the radiator cap. Make sure it seals at the right pressure. And be aware there are 2 hemi sensors. One for the gauge and one for the ecu.

FordTruckMan92

Well that explains alot. I do have bubbles in the radiator, upper hose and reservoir when it gets hot.

I know of the sensor on the engine by the distributor, where is the second one?

Pulled codes again, 118 (coolant sensor) and 998 (hard fault present) any ideas what would cause the 998?

FordTruckMan92

I rented a block test and fluid, no exaust gas in coolant. Coolant and oil colors and viscosities are normal. I have a compression tester in case i need to test that too. I will try flushing the coolant system see if there is something clogging it up, every time i had to replace something the coolant flowed out and refilled just fine so i did not think anything of it. Bought a new cap for it, not sure if it works yet engine almost over heated in the five minutes i was trying to check for exaust in the coolant.

I have not let it red line, no leaks visible just when it dumped out from the reservoir, i also did not pour water on it so that it would cool down on its own.

FordTruckMan92

Did a flush for 10 minutes, sealed the system and let it run with just water for another 10, it got up to "al" in normal (had the heater running to help clean and flush that too). Used the bock test fluid and it could not find any exaust gassess, but when i shut it off it boiled up and the cap releived the pressure dumping it on the ground(never saw the old cap do that). I am getting more coolant so i can get the 50/50 it needs and hopefully then it will be fine.

Is there any other tests i should do to check if it is a head gasket or was that already ruled out?

Warlockk

Don't waste the coolant until you get the overheat under control. It should run just fine with water so the coolant will just boil out. Granted it takes a hotter temp to boil, but its still not working right. I would suspect the water pump. Unfortunately its hard to test. You can kind of watch to see if the water flows well but that's about it. But for the 30-$50 depending on brand its worth replacing it. Or you can pull it and physically examine it. But then you have done all the work anyway.

FordTruckMan92

Water pump is new and working. I checked the fan and it is spinning in the right direction (pulling air through the radiatlr pushing it over the engine). The only thing i can think of would be a clog in the radiator or engine, but the fluid was flowing just fine when i was doing the flush.

I am going to buy a new rad tomorrow unless anyone has any other ideas.

Aktech

I bet someone put a stop leak in it and it plugged a port up.

FordTruckMan92

That would not surprise me. The previous owner new absolutely nothing about maintaining a vehicle and it did have a small leak from the overflow line going to the reservoir, cut an inch off the hose and no more leak.

FordTruckMan92

Replaced the radiator, still overheated. Talked to a mechanic and he told me that i had a hairline crack in one of my heads. Now the question is rebuild this one or drop in a new one.

Any thoughts?