Radiator cap allows overheated fluid to backpressure reservoir
2001 PT has 54k miles and is overheating.
No smell at exhaust, oil is clean, antifreeze looks clean. Air temperature around 95' hiway driving with ac on gauge will flicker up then down, then into the red quickly. I stop imediately and observe that no fluid is escaping except thru the reservoir cap. Heater works and upper hose is too hot to touch.
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Overheating can be "boiled" down to a few issues:
*blockage: Something is stopping or slowing the flow. Main suspect is the thermostat. It is designed to open and close at the proper temperature so as to keep the engine at the optimum temperature range. They have a tendency to lock closed and cause overheating. Sometimes it's random. The blockage may be something like sludge or rust in the radiator or gunk that someone put in that does not agree with it.
*coolant/water loss. A leak somewhere. Blown head gasket, cracked head/block, hose, etc.
*pressure loss. This happens when the water gets to boiling temperature but is kept under control by pressure (pressure resists heat) and then something such as the radiator cap releases the pressure and the temperature rises. The coolant will also leak out and then the overheating will be due coolant loss as well. This is especially true with the Cadillac Northstar. The head bolts allow the head to lift off the block, ever so slightly, and pressurize the coolant system with exhaust gases beyond radiator cap pressure limits. It's usually when you accelerate or put the engine under load such as going up hill.
^check for exhaust gases in the coolant. smell it or buy a kit to test.
^get a new thermostat, or, test the old one by boiling it in water on the stove; see if it opens. I always get the "failsafe" kind: fails in the open position.
^check for oil in the coolant or coolant in the oil: grey sludge.
^check for leaks on the ground.
^test the radiator cap. some part stores have a way to test them.
^check to see if it's made by Cadillac. look for the word Northstar. If so, hold on to your wallet. There's a whole new world of overheating adventures.
Could be an overheating problem, the head may be reaching a certain temperature that causes it to warp. It would do that if it had overheated in the past. Check the radiator and see if there is oil at the inside top of it. If there is, remove it and replace with anti-freeze and water. Then add AlumaSeal aluminum powder to the radiator fluid through the radiator cap, not the overflow container. Clean the surfaces of the radiator cap and radiator before replacing the cap.
check your hoses, water pump heater core radiator cap, if car has been overheated, check exhaust for steam and smell of coolant, check oil make sure it is not milky, last 2 are symptoms of blown head gasket
Well it sounds like you have covered most of the bases. One thing that could cause overheating is a restriction in the exhaust. Do you know if the radiator fan is coming on when the engine reaches 220 degrees ? How long can you drive it before it starts overheating, and does it boil over when it does ?
You vehicle blows head gasket very easy,to say it overheated and radiator is solid then you have combustion entering the cooling system. when the engine has cooled down and you can open the radiator cap smell the coolant does it smell like fuel or exhaust? If it does you definately have a head gasket
what would cause the 2001 honda civic to over heat after brand new water pump theromastat timing belt and alternator blet replace yesterday and when it overheated i pulled over and checked all the fluids i had like oil or transmission fluid all over my under part of motor alittle on my breather and top part of hood , the oil also has a tendency to smell like gas but its not oil/gas mixture please help
Do you see white smoke from the exhaust? If so you may have a blown head gasket especially if this engine has overheated. Check the oil level and if it is overfull and looks like a cup of coffee with creme in it, you have coolant in the oil. Remove the oil cap, and if you see a foamy broth under the cap that is another sign of an internal coolant leak. If you see none of this then you have a leak somewhere. Fill the reservoir and radiator with coolant. Park the car over a clean driveway. Start the engine and then let it sit and run until you see where the leak is coming from.
If it is a head gasket allowing the engine to pressurize the cooling system, the coolant will smell like exhaust and will bubble from the radiator with the cap off.If it is also affecting the combustion process in one or more cylinders, the engine will missfire and the coolant will smell like gasoline.