When I turn the A/C off it is fine. When I run the car with the degas cap off, the A/C runs well and the car does not overheat. The coolant level doesn't decrease either after the overheating, and it doesn't bubble. I ran it without the cap to see if there was air in the system. Also, the heat does NOT work with the degas cap on, but it does when the cap is off. In summary, with the cap off, both work properly, with it on, they don't. I have replaced the pressurized cap already.
The LS has a hydraulic cooling fan up until the 2003 model year. I had a heck of a time trying to find the overheating problem on my 2001 LS V-8. The degas bottles are known to split and leak . I replaced mine as it had several splits in it. That didn't help at all. The problem that causes the over heating most of the time is the hydraulic actuator solenoid that is on the hydraulic cooling fan pump on the passenger side of the engine. If you have the car running with the hood open and the a/c on hi cool, the cooling fan should be spinning very fast! The fan should make a pretty loud noise. Mine would spin but not at the high speed it should. If the actuator is not kicking on and opening the valve that allows the hydraulic fluid to spin the fan at full speed then your engine will get hot.
You can find the actuator online for under a $100. To find where it's located get under the passenger side of the car. Find the pump which is on the front of the engine. The actuator is on the side of the pump and hard to get to and see but take your time and use a good light.. Look for a wire that powers the actuator and it will lead you to it. It is a tight job to replace it but it should take no longer than an hour.
SOURCE: 2002 Lincoln LS, V6 overheats
Did you purge the air out of the syst.? Also you replaced the fan but are they coming on? have you checked the fuses and relays? if all this is ok then is the computer comanding it on? Is the computer getting correct info from Eng coolant temp. snsr (ECT)
SOURCE: I have a 2000 lincoln
Water pumps go bad when they leak. If there is a lack of circulation, there could be a clog in the system. Is the heater core getting hot on both tubes at the firewall? If not, then the heater core is clogged up. Has anyone ever put too much sealant into the cooling system that would cause an overheat condition due to lack of circulation of coolant?
Good luck on this repair.
SOURCE: there were no issues with
Ok, first thing, its a Ford Product. Thats an issue for another time. But for this problem, perhaps you bought the wrong thermostat for the car. They are made to open at specific temperatures. If the one you put in opens at say 200 degrees, and your car wants one that opens at say 145 degrees, then your gonna over heat even before you have any water flowing through the engine to keep it cool.
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