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Re: My 1998 ford expidition temp rises suddenly then...
Could be a few things, - low coolant - bad thermostat- thermostat installed wrong - bad tempature sensor - loose connection to sensor. wiring to gauge. look for the easyest things first.
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IF your symptoms are when driving , the temp gauge acts normal rising slowly. Then all of the sudden it goes high and a second or two later it goes back to normal. Then you have low coolant in the engine. The reason this happens is because of air pockets. Air pockets are much hotter than the coolant. Check for coolant leaks...
The cooling system has an air pocket in it. The best solution is to have someone with a vacuum coolant system,and drain and replace the coolant. The only other way,is to jack up the front of the vehicle,and take off the radiator cap,and run it with the heater on full blast. Wait till the thermostat opens,(when coolant level drops)...then top it off while its still running.If you buy ,or have a friend who has a tool called an "Air Lift",..it will make this MUCH easier,and cleaner to fix.
Hi! The MAF (mass air flow) sensor is surely faulty. The MAF has big contribution on the engine performance specially on the idling an vacuum supply. If the MAF is faulty the rpm will drop eratically or die. Regarding the overheating problem, you may want to check the radiator blower for it may be tripping that sometimes it works and sometimes won't. This can be a good cause. Hope this helps and thank you for using FixYa!
Have you tried replacing the overflow tank cap. These don't hold pressure as it should which will cause the temp to rise. EX: the cap rating is 15psi, and the cap has a defect which only allows the cap to hold 10-12psi. That water has to be pressurized by the cap for the water not to flow out. Also, does the temp gauge reach a high level or just the temp light comes on. This will give a better idea of the problem. If the gauge is normal but the light is on, sounds like a temperature switch is bad.
It sounds like you have air in the Cooling system and the bars leak permanent seal does not help. The sealer creates restrictions through out the water jackets and can cause the thermostat to stick. Replace the radiator cap and run the truck with the radiator cap on the first click and keep an eye on the over flow tank, refill the over flow as needed and make sure you have the heater on the highest setting to work out all the air in the system. Once all the air has worked it's way out of the system, then you can close the radiator cap to the second click to ensure full pressure is built up in your cooling system. Good luck and keep me posted.
Your thermostat may be stuck in a partially opened position. This would account for the low temp while driving.You can check it by removing it (it should be closed when at room temp, if it's not, it's defective) and dropping it into a pot of boiling water, it should open completely within a few seconds. Also make sure your coolant level is correct, and when idling, check to make sure the engine cooling fan is kicking on when the engine temp rises.
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