Hello I have a 338 with 250k miles. First problem is when pulling a hill empty or loaded, temperature goes to start of redline. As soon as you start going downhill it goes back to normal. It also does it on flat roads but towards the end of the day. Changed all the hoses and belts. Thermostat too. Had this problem for awhile but seems to be getting worse. Now it is losing maybe a quart of coolant a day. Seems to be pushing coolant out of the overflow hose that comes out of the coolant reservoir. Coolant reservoir stays full but radiator is low. Also fan seems to be always on. Any help would be appreciated. Thanks.