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Since the heater core acts much the same way a radiator does, the fact that running the heat is removing the overheating indicates a possible problem with air flow through the radiator. This could be due to:
It is not recomended to flat tow your expedition with the engine off and driveshaft in. The oiling system in your transmission runs off of the engine. You can tow short distances but the transmission components will be turning without fresh fluid being moved through them. This will cause exessive wear due to the fluid overheating and losing its ability to lubricate properly. You can flat tow unlimited distances with the engine ideling or the driveshaft removed. if you chose to tow with the engine running you should stop often to make sure you are not overheating the engine. You may not get enough air flow to the radiator while the expedition is behind your motor home.
No idea without a good look under the bonnet ,check the bottom hose is getting hot and then reply to this post when you have a better idea so i can think about it
Your engine is overheating because the coolant is not flowing properly. If you have clogs in the cooling system changing the thermostat is not going help very long. Depending on what the material is that's causing the clog it will eventually prevent your new thermostat from working as designed. Buy a radiator flush kit and flush the system. If your heater core is clogged it may prevent heated water from entering it (that is where the heat is radiated from).
Overheating means not enough cooling due to some blockage from the cooling path. It is not necessary to have a leak. When the coolant is stagnant, coolant is not able to flow through the water jacket, radiator by the help of the water pump then heat can't be dissipated through the radiator fins therefore engine gets overheated. You need to check these followings. 1- Thermostat: if it is not open then you get overheat. 2- Radiator: if it gets clogs up coolant can not flow thruogh. 3- Water pump: it the bearing is broken, it can not circulate coolant to the radiator. Hope this can help.
There is a blockage in the engine coolant path causing insufficient cooling. When the coolant flows, it removes the heat produced from engine combustion to radiator to cool. If there is no flow then the coolant becomes stagnant, therefore the heat is built up without being dissipated to nowhere hence the engine gets overheated. If this is not fixed then the heat will cause the head-gasket blown due the the metal expansion. Repair at this stage becomes very expensive. 1- Take off the thermostat. 2- Put back the hose connection. 2- Run the engine and feel the upper hose to see if cooling flowing through it. 4- IF Yes. Run engine like this for few days, if no over heat , buy a new thermostat and put it back. Your problem is resolved. 5 IF No. You have a bad radiator. It clogs up so you don't feel the cooling flowing. Buy a new radiator, don't ever use a rebuilt one. Good luck.
The overheating problem is due to the leak. Radiators are suppose to hold pressure and it is Pressure that changes the Boiling point of the water.
Without the Pressure the water will vaporize at a lower temperature and you will not get good cooling. You could also have a clogged system. Also test the Radiator cap.
There are several ways to try to fix this. Radiator Sealant, Rebuild your Radiator, or buy a new Radiator.
The sure solution is buy a new Radiator. Rebuilding one is a little cheaper sometimes, but you may pay someone to put your old parts on a new core. At best, the bad spot can be braised and the rest of the Radiator is good. Buy a new one and do it yourself. You are not paying someone and getting back used parts this way.
Sealant- If you do this you should clean the system first. They make a Coolant system cleaner. Then get a really good brand of Sealant. Not a K-mart item but something over $15 and sold only at NAPA or ask the Dealer. But you will have invested about $25 in cleaner and Sealant with just the Hope of success.
Since antifreeze is over $8 a gallon you need to think about the best way to keep it in the truck.
The coolant flush on radiator doesn't do any good. Since you have changed all the key components and still gotten overheated, then the root cause of the problem is the radiator. It got clogged up in small tubes blocking coolant flow. No matter how good the water pump is working but the radiator got clogged up, coolant is not circulating therefore the heat from the engine can't be dissipated to the radiator. Replace your radiator, don't even think about rebuild it. It has been used for 11 years. Make sure to have the correct coolant/water ratio to keep radiator life for years. Good luck.
Clean out your cooling system, flush it and make sure the radiator is not clogged. You could be overheating due to a clogged up radiator. If you put your hand on the radiator, it should be the same temperature all around. If clogged up it will be colder in the middle and very hot where the water comes in from the engine. CAUTION not to burn yourself, use of IR thermometer recommended.
If that's not it, then check your head gaskets.
You may have a busted radiator hose, or a leak somewhere. Overheating can also be caused by a clogged up radiator. The sypmtoms of clogged radiator is overheating at higher engine speeds, such freeway driving, but street driving is okay. The first thing you should be concerned right now is do not use the car untill the overheating problem is fixed, because overheating will surely damage the engine. Second, check to determine if there is no major damage to the engine at this point. Check your oil conditions. If its milky in color, which I hope is not. If it is milky in color thats a major repair, that cost a lot of money. I hope that everything is still okay on the engine, get the overheating problem fixed first which is a lot cheaper than replacing a bad engine, before you use the car again. Hope this is helpfull for you.
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