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When i shut off my car antifreeze leaks from the rear of the engine block

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Either a freeze plug or a head gasket is leaking back there. The freeze plug looks like a large metal bottle cap without threads, with the flat part pushed into the block first.

Posted on Mar 17, 2011

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Posted on Jan 02, 2017

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SOURCE: 90 Mitsubishi Montero Antifreeze leaking rear portion of engine

Put some bars leak in it. It cured mine. Just be careful to loosen the radiator cap at least weekly since the bars leak will tend to glue the pressure relief shut.

Posted on Apr 08, 2009

cadman000
  • 607 Answers

SOURCE: Pinhole antifreeze leak coming from engine block

GM has a sealing tab, helpful in similar situations. Inquire at the dealership parts counter. Hope this helps

Posted on Apr 30, 2009

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SOURCE: antifreeze leaks out as soon as added to engine.

pet **** drain loose at the bottom of your radiator maybe!

Posted on Oct 04, 2009

fishdoctorfi
  • 178 Answers

SOURCE: leaking antifreeze from rear of engine block

There is a freeze plug on the back of the motor you cain't see.[under the bell housing]...may have a rust hole in it or just bad ??

Posted on Dec 20, 2009

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How likely is it to have a head gasket leak or cracked block? and if nothing is added like antifreeze will it crack the block?


YES
antifreeze is needed in every engine as the additives in the antifreeze stop the water boiling at the cylinders, stop corrosion of the aluminium, stops the water freezing down to -10 C , lubricates the pump seal
Will it crack the block and heads ---most definitely as water expands on freezing and as it has no place to expand to and weak sections of the cast will fail and as cylinders and linings are less than 1.4 " thick that is what breaks
your cheapest fix now is a good serviceable engine from a rear ender from the wreckers /junk yard
OH -- and yes-- only use accredited mechanics from accredited service centres in the future

Jan 09, 2017 | Chevrolet Cobalt Cars & Trucks

2 Answers

Where are all the freeze plug located on 4.6 w/auto. is there one between the block & transmission


Yes, there are expansion plugs (freeze plugs) on both sides of the engine block and at the rear of the engine block between the engine and transmission. There are also a couple in the ends of the cylinder heads.

With all that said, I would like to add that many times with that engine, the heater tube and connecting hoses can leak and be mistaken for a rear expansion plug leaking. I would definately check this before pulling the transmission out.

There is a tube that runs from the back of the water pump under the intake manifold and out the rear of the engine where it hooks up to the heater hose/heater core. This tube has a small hose connecting it to the back of the water pump. There is also a hole in the back of the engine block that will allow antifreeze from under the intake manifold to leak into the transmission bell housing area. When this tube or hose leaks, it often gets mistaken for a leaking rear expansion plug.

It is very easy to check for this. Remove the serpentine belt and remove the alternator and look under the intake manifold down in the "valley" between the cylinder heads. If there is antifreeze in there, the hose or the tube is leaking. Look at the picture below. Item #3 is the tube and hose assembly I am talking about. Usually, just the hose is leaking. It should be replaced with a short piece of SILICONE heater hose. On some of the vehicles, there are 2 hose clamps. On others, the end of the hose that is attached to the tube has a crimped collar on it. If yours is like this, you can fix it by carefully cutting the crimp collar off and replacing the hose using band clamps. (screw-type)

Also look for antifreeze leaking into this area from the front intake manifold runner. They tend to leak on the front runner near where the thermostat housing is located. These will also leak into the valley area and run out the back of the engine. If the manifold is leaking, chances are it is warped. DORMAN makes a replacement intake manifold kit just for this purpose because it has been so common. It is also very easy to check for this with the alternator removed.
The DORMAN part number for your vehicle is 615-178 (See second picture below)


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Sep 21, 2011 | 1996 Ford Mustang

2 Answers

I have a 1991 nissan pickup. The engine started getting hot, as i was driving it lost power and eventually shut off. I didnt see any water leaking so I checked the oil and antifreeze was in the oil. Now it...


I would really be concerned about the antifreeze in oil, sounds like head gasket at least or head, block problem, even if you dont see antifreeze leaking, the engine can burn it and exit through tail pipe-white smoke or steam (beyond just cold start-up)

Jan 28, 2011 | 1991 Nissan Pickup

2 Answers

My car recently shut off when i was driving in town. it did not have much oil in it and it had an oil leak i pushed it off the road and put oil in it but the car didn't start. i noticed the antifreeze tank...


Could be several things from radiator ,hoses,water pump, FREEZE PLUGS ,cracked head or block. You need to find out where the coolant is coming from to determine it.
If the car was hot and you poured fluid in it the block,head or head gasket could crack. If it was cold and you just had watr in it the block could crack or freeze plugs could have came out.

Jan 16, 2011 | 1996 Mercury Mystique

1 Answer

Leaking antifreeze from rear of engine block


There is a freeze plug on the back of the motor you cain't see.[under the bell housing]...may have a rust hole in it or just bad ??

Dec 20, 2009 | 2007 Toyota 4Runner

1 Answer

Pinhole antifreeze leak coming from engine block


GM has a sealing tab, helpful in similar situations. Inquire at the dealership parts counter. Hope this helps

Apr 30, 2009 | 1997 Chevrolet Lumina

2 Answers

90 Mitsubishi Montero Antifreeze leaking rear portion of engine


a couple of things could be wrong the rubber ring on the back of you water pump is leaking or the hose for you heater core!!

Mar 16, 2009 | 1990 Mitsubishi Montero

1 Answer

Leaking antifreeze fluid from under the engine.


might be a freeze plug leaking, or heater hose. there are three freeze plugs on each side of engine and two in back of engine. most likely if any of them are leaking, it will be the one behind the starter on the far right rear of engine block. they have also been known to leak around the front and rear of intake, where intake, head, and block meet.

Feb 01, 2009 | 1995 GMC Suburban

2 Answers

1995 dodge dakota antifreeze leak


Check out your freeze plugs. They are thin metal cups that press fit into the side of the block. Use a mirror and a light to inspect while the engine is running.

Jan 19, 2009 | 1995 Dodge Dakota

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