I have a 2003 T-bird with the same V8 as the LS. After changing a thermostat the car kept burping coolant out of the reservoir. Found that a nut in the plastic thermostat housing came loose and did not have a good seal. Strange it did not leak fluid, but just sucked air in the system as the engine cooled off. Replaced these parts to fix that problem, but now I am loosing coolant out the back of the engine. Coolant is leaking out where the transmission bell housing bolts to the engine. Any one have this problem on LS with V8?
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1. The radiator cap if working correctly it will release pressure in the system provided the cap you have is the correct pressure setting. If you are having a problem with pressure then replace the cap with a new radiator cap with the correct pressure setting. Do not use a cap with a pressure setting other than the original equipment pressure spec. So you do not go to the parts store and buy any radiator cap on the shelf that fits because they come with different pressure ratings and some of these will be totally unsuitable for your car.
2. If the pressure valve is stuck in the "old" cap the pressure release system will not work.
Air pockets in the cooling system can definitely cause overheating and can retard coolant flow through the system. If you are draining the radiator to replace the coolant or replacing the radiator you need to follow the correct procedures for bleeding air out of the system for that particular engine after coolant refilling. Some engines have bleeder screws on the cooling system to assist in the air bleeding procedure and some don't.
There are various causes for overheating so don't assume it will necessarily be solved by bleeding any remaining air from the cooling system and replacing the radiator cap with one that works.
Other causes can be...........
1. Faulty cooling system thermostat. (Replace the Thermostat)
2. Faulty water pump, especially if the impellers have corroded away or have disintegrated in the case of those design genius water pumps with plastic impellers. (Replace the water pump)
3. Cooling fans not working and if so the cause needs to be tracked. Check that your fans are kicking in. If the engine is overheating the fans should be running because they will switch on when the coolant reaches a specific temp and well before the coolant gets excessively hot.
4. A partial blockage in the coolant passages inside the engine but not in the radiator if you have a new one. If the coolant is not changed at the required intervals(frequently the case with many owners) or is over diluted with water you can get a build up of debris. If products like stop leak have been used in the system this can create similar problems with partial blockages inside the engine coolant passages.
5. A compression leak into the cooling system.
If you have bled air from the system and have continuous air bubbles in the cooling system I would suspect a compression leak. In that event a basic leak down test will show if you have compression gasses leaking into the cooling system and from which cylinder(s). The spark plug is removed and compressed air is forced into the cylinder via the spark plug fitting and air bubbles will show up in the coolant of there is a leak into the cooling system.
Have the problem with overheating addressed immediately. Running the engine with an overheat condition will cause expensive engine damage many times the cost of fixing the overheating issue.
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?
You could just be burning it up. Do you have accesive white smoky exhaust? Have you filled radiator completely. Fill completely once while vehicle is running, burp upper radiator hose while adding. Then wait 10 minutes and the coolant level should drop in radiator as it will flow into engine block. This is where you want to fill the system again, and put the cap on.
I just bought a 2000 Lincoln ls V8 3.9L, i've had it for couple of days.I took a drive in it the other day, and noticed the car was overheating. Replaced thermostat, and water pump. Car is still overheating, I need some help?