My jeep keeps overheating. i would let it completely cool off. looked inside the radiator and resevor which both were full. i could then drive it another 1or 2 miles before i would start to hear a clanking noise. the fast i would go or any slight of hill would make the gauge on my dash raise. so whats my problem?
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Cooling fans not turning on, check to make sure the cooling fans are running when overheating occurs. Not enough coolant in the cooling system, check the coolant reservoir make sure the coolant is at at the maximum level when combustion engine is completely cool,if your coolant is low add coolant to the maximum level. (1)Start combustion engine, let it warm up but not over heat. Turn off combustion engine, when it cools completely the coolant reservoirs level will be lower . Add more coolant and keep repeating (1) until the coolant level stays the same after combustion engine completely cools down.Sensor that tells the cooling fans to turn on defective. Non functioning thermostat. Broken impeller inside Water Pump. Clogged radiator. Clogged water jackets in combustion engine. Broken drive belt. Radiator has something blocking the cooling fins(possibly a plastic bag that went against the cooling fins when driving)
A possibility is the water pump. This is what circulates the water through the engine and back to the radiator for cooling. Water pumps consist of several vanes attached to a rotating shaft. If a few vanes are broken, you'll get reduced water circulation, causing overheating.
If the pump isn't leaking or noisy, it's good. If the hose came off and the engine overheated you may have blown a head gasket (radiator hydrocarbon test is best to determine that) if you see steam from the tailpipe, coolant in the engine oil or oil in the coolant that also is a big clue. Jeep engines tend to rust internally. the rust packs into the bottom of radiator core, especially after an overheat. Therefore, don't trust that because the radiator looks good that it is good you cannot see what's actually inside it. (you could try back-flushing but should do that with the radiator removed to do it right). If you see any improvement after flushing, replacement would be a good idea.(unless it completely works). You can use plain water in the cooling system while testing. Just don't leave the water overnight so it can freeze.
There are a few things you need to check: First, make sure the cooling system is free of air. This can be done by loosening the bleeder screw while the engine warms up and closing it when only coolant spills out. Also, look for any leaks from the radiator. Keep in mind it could be leaking internally. Make sure the cooling fans are working. Check the fuses and switch the cooling/radiator fan relay with a nearby relay like the A/C compressor relay or another relay you know to be working. If the cooling fans aren't engaging, there may be a wiring issue or they may need to be replaced.
Are the electric fans coming on?
You have a water flow problem.Either engine or radiator.These are the 1st 2 things to look at.
Barring head gasket problems(which is unlikely)I would get these things checked by a GOOD radiator cooling specialist.
Hope this helps
Clutch Fan are known to fail over time, but I wold not rule out the radiator. The small passages inside the radiator will clog due to age. You did not mention how many miles are on the Jeep or if the Aux fan is kicking on.
Need to know what caused the overheating, possible broken serpentine belt, thermostat, water pump, radiator, fan clutch, cooling fan motor. After motor has cooled down fill radiator with water till full, look make sure serpentine belt not broke, start engine run about 5 minutes, turn off, let sit 3 minutes, start engine look at temperture gauge is it over half way of gauge, Do you have a fan blade driven by water pump or electric fans?
Did you put a new cap on the radiator? Small as it seems, if it does not provide an adequate seal on the radiator, than the system does not get pressurized, thus keeping the boiling point around 212 deg. your engine gets way hotter than than normally. When sealed right, the pressurized system raises the boiling point to close to 300. thats how is works. If thats not it,(assuming it is the last thing replaced) than you might have either a cracked head/ head gasket/ valve guides, cooling ports, basic large dollar items. Lets hope for your sake the problem is still in the cooling system, before you look at the motor. If you take out the sparkplugs, you'll be able to tell real quick, rusty, burnt whitish-orange looking condition. Good luck
Everyone keeps ignoring clutch fan on water pump. If it does not lock up when engine is hot, only the electric fan will be operating. With the undersized radiator used on Jeeps, it will cause overheating!!!