Coolant leaking on manifold, steaming.No hose or radiator leak.
I have a 1991 4runner 4x4, 6 cyl, that's losing coolant and steaming. Puddles underneath toward the rear passenger side of the engine. No hoses or radiator leaks. Just bought the car 2000 miles ago. Everything was fine. Got an oil change a week ago and the problem started 30 minutes later. Oil The heat doesn't come out hot anymore. Went thru a gallon of coolant in a week. Hoping not head gasket. Please help.
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Probably a pin hole leak some where in a rubber type pipe, hose clips may need tightening or your radiator may have been damaged by a stone coming through the grill. You could try getting some one to sit in car and keep revs up on engine until you can see where any steam is coming from, beware steam is very hot. If you find the leak let engine fully cool down before starting any work.
Coolant leaks,When the intake manifold gasket cracks or blows out, coolant will leak out of the intake manifold. You may see puddles underneath your car or notice smoke or steam coming off of the engine and exhaust from the coolant dripping onto it and then burning.Overheating, If the intake manifold gasket fails and allows coolant to leak out into the engine, your car will begin to overheat. If your car frequently runs low on coolant or begins to overheat, check the intake manifold gasket.Running poorly, When the intake manifold gasket falters, it affects the way the motor handles its emission gases. The change in pressure can affect the vacuum in the intake as well as how smoothly your car runs. Mainly, it will idle roughly and may hesitate, cough or sputter.
the code is for coolant leak large. Check coolant level and top off. check the oil for moisture. pull the plugs to see if any are steam cleaned. either one could indicate a bad head gasket or worse damaged head. Check to see if any new hoses have been added. tighten clamps if needed. look on engine block for any puddles where coolant could be leaking. pressure test coolant system and check for leaks. If you can smell coolant inside the vehicle check the heater core. lastly have an emissions test run with the radiator cap off and at running temperature. Start vehicle with cap off to avoid spray of hot coolant. This tests head gasket and cyl head for leaks.
Does your oil look normal? If it has a milky look that means coolant is getting into it somewhere. Do you notice more than normal steam or white smoke coming from the exhaust? Those are signs of a head gasket leak or an intake manifold leak. Do you notice the smell of coolant when you open the hood? They are notorious for have intake manifold leaks. There is also a heater hose fitting on the intake manifold that is notorious for leaking. I would test the cooling system with a pressure tester. You may be able to rent one. They are simple to use. Just remove your radiator cap and install the tester and them pump it up to the PSI listed on your rad cap. Let it sit and look for leaks. Pay special attention to the intake manifold, water pump, all hoses and radiator. Are you noticing anything inside the cab like the windows always fogging up or puddles on the floor. That could be a sign of a bad heater core. Pump it up and let it sit for a while and watch to see if the pressure drops or you see a leak. You may have to start it after a while as sometimes water pumps will leak when running and not when off.
IF the heater core was leaking you would notice it inside the car. You would notice the smell of coolant inside. Also your windshield would probably instantly fog up when you turn the heat on. Do you notice puddles of coolant under the car? You can buy or possibly rent a cooling system pressure tester which is simple to use. You remove your radiator cap and itstall the tester and pump up the cooling sytem to what ever PSI your cap is rated for and let it sit for a few minutes. IF the PSI drops that means there is a leak somewhere and you should be able to find it if you see any puddles under the car. If not you may have an internal leak such as a bad head gasket or cracked head. Or possibly a bad intake manifold gasket. Does your oil look milky. If so that means there is coolant in it? Do you notice excessive steam or white smoke from your exhaust? If so I would suspect a head issue.
Are you noticing any puddles under your truck? You can buy or possably rent a pressure tester that you just remove the radiator cap and hook the tester up in it's place and pump up the cooling system and watch for leaks. If there are no puddles it must be leaking into the engine from a leaky head gasket or intake manifold gasket. Do you notice excess steam or white smoke from your exhaust? Does your oil look milky? If it does water is leaking into the crankcase. Does it run rough at all? You can start your truck with the radiator cap off and watch for bubbles. If you see alot of bubbles it could be exhaust or compression gasses which would confirm a bad head gasket or cracked head.
it could easily be burning the antifreeze through a bad head gasket. if when warmed up the upper hose is quite stiff indicating the system is under pressureand you shut it off,even waiting until the radiator fan comes on and then right away turning of the key,wait and see iff anything runs out.the water pump would have to be looked at from below while the leak is ocuuring= reason must mechanics suffer a lot of burns. or with a sall extendable saft mirror. you could also loose antifreeze from a heater core leak but that would give a lot of steam on your windshield inside in the cold weather,or the carpet would be wet inside the car
check condition of radiator,radiator & heater hoses,look for spots wet w/ coolant.look more or less straight up above where coolant puddles on ground.engine block is equipped w/'freeze plugs' that sometimes corrode & leak.washing suspected area of leak with an engine degreaser product may aid in locating source of leak.