Been over-heating and found sludge in engine coolant
1991 toyota 4x4 started overheating. Kept extra water jug with me and drove it a few more times. Sometimes it didn't overheat, but usually did. Decided to flush the radiator with water to see if some rust or other contaminant would come out. Surprisingly, found a lot of thick, dark-gray looking sludge. Where did it possibly come from? Decided to check thermostat and water pump. Found this sludge in both areas. This is as far as I've gotten. Have waterpump and radiator pulled off at this point. Help!!
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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.
you need to replace thermostat and radiator cap.look under hood around engine compartment.look for a radiator cap near radiator,add 50/50 antifreeze and water to coolant system to bring up boiling point.pure water will cause engine run hotter because water evaporate away,remove radiator pour coolant in the radiator until coolant stop dropping in the radiator now some vechicle pour coolant in the coolant overflow jug,pour coolant until coolant level stop dropping and the coolant level stay at cold full mark.start engie let idle few minutes, watch coolant level in radiator if coolant start dropping add more coolant, when coolant level stop dropping put radiator cap back on let engine idle until both top radaitor hose and bottom coolant hose get warm turn off engine wait until it get cool then take a large rag slightly open radiator just a litle at a time to keep from getting scaled.once radiator remove add more coolant if low,put radiator cap back on start the engine let it idle watch the temp gauge if temperature gauge going hot zone stop engine wait until cool then add more coolant,keep doing this until engine stop overheating going into hot zone and coolant level stop dropping,make the coolant overflow jug coolant level stay at full cold mark, dont let jug run empty if so air will get in the coolant system causing engine to overheat.
If there was red antifreeze in there before, adding green product can cause sludging in the water jacket of the engine. They are not compatible. The right type for this engine is the red or orange type.
Have the system drained and flushed a few times, and refill with red type coolant mix.
YOU NEED BLEED AIR OUT THE COOLING SYSTEM.WAIT TO ENGINE COOL DOWN.YOUR VECHICLE YOU HAVE TO POUR COOLANT IN THE COOLANT OVERFLOW JUG UNTIL COOLANT LEVEL STAY AT THE FULL COLD MARK.THEN START ENGINE LET IT IDLE A FEW MINUTES WATCH COOLANT IN THE OVERFLOW JUG WHEN IT DROPS ADD MORE COOLANT UNTIL COOLANT LEVEL STAY AT FULL COLD MARK.WHEN COOLANT LEVEL STOP DROPPING IN OVERFLOW JUG.SCREW RADIATOR CAP BACK ON OVERFLOW JUG WATCH ENGINE COOLANT TEMPERATURE GAUGE AS COOLANT TEMPERATURE START CLIMBING TURN OFF ENGINE LET IT SET A WHILE KEEP FROM GETTING SCALDED.TAKE LARGE RAG PLACE OVER COOLANT OVERFLOW JUG CAP SLOWLY OPEN RADIATOR CAP A LITTLE AT A TIME UNTIL PRESSURE RELEASE.REMOVE OVER FLOW JUG CAP.ADD MORE COOLANT UNTIL COOLANT LEVEL AT THE FUL COLD MARK ON THE OVERFLOW JUG.THEN SCREW CAP BACK ON THE OVERFLOW JUG.START ENGINE LET IT IDLE AGAIN WATCH ENGINE COOLANT TEMPERATURE GAUGE WHEN TEMPERATURE GAUGE START CLIMBING.TURN OFF ENGINE WAIT A WHILE.CHECK COOLANT LEVEL IN THE OVER FLOW JUG.DO THIS PROCEDURE UNTIL THE COOLANT LEVEL IN THE COOLANT OVERFLOW JUG STOP DROPPING AND STAY AT FULL COLD MARK,WHEN THE TOP RADIATOR HOSE GET HOT THERMOSTAT OPENING AIR IS OUT THE COOLANT SYSTEM. WHEN ENGINE COOLS DOWN.CHECK COOLANT OVERFLOW JUG COOLANT MUST BE IN THE COOLANT OVER FLOW JUG AT THE FULL COLD MARK WHEN ENGINE COLD. DONT .DONT OVERFILL COOLANT OVERFLOW JUG.KEEP COOLANT IN THE OVERFLOW JUG IF YOU LET COOLANT OVERFLOW JUG RUN DRY AIR WILL BE DRAW IN COOLANT SYSTEM CAUSE ENGINE TO OVERHEAT.
need add add antifreeze half antifreeze and water to raise coolant boiling point. replace thermostat and radiator pressure cap.wait until engine cool then try starting it up.depends on how long you drove car when engine over heated.if you turn off engine soon as it over heated no harm done.if you kept on driving and engine die of lack of cooling, and car wont crank you could have blown head gasket warped or cracked cylinder head.
Is there a leak somewhere? There should be green or pink fluid on the ground if there is. The plastic jug is often called the overflow this has level marks on the side of it for when the vehicle is hot and cold, cold is at the bottom end of the jug. The purpose of these marks is so you can see the levels without having to open the radiator. When the engine is cold open the radiator, start the motor and look into the radiator there should be coolant at the top of the opening. If not add coolant while engine is running, note if it's pink it's the DEX/Cool, if green any over the counter coolant will do. Add until the level hits the top of the opening. Let the engine heat up and check the level again. If it's full put cap back on and note the level in the overflow jug. If engine is hot level should be at the top mark, be sure to NOT fill the jug to the very top as it needs the space to expand for any over flow from the radiator. The system will pull extra coolant from the jug when it's cold and use it until the proper temperature is reached then it will "spit" the extra back into the jug. (that's why there are two lines 'hot' and 'cold') Never add water to the jug as it will cause the jug to crack if the outside temperature goes below freezing always add coolant/antifreeze.
White oil means water or coolant is leaking in via Head Gasket Failure or a crack in the head.
Along with repair - be sure to have each cylinder compression tested to see if there is a crack that has developed.
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