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Jack Johnson Posted on Mar 16, 2014
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Engine coolant leaking from rear of engine

I just replace the radiator as it was definitely leaking from the top tank gasket. whe i went to refill it with coolant, I first started filling the engine through the top hose. I then noticed that coolant was rapidly leaking from the rear of the engine. I could not see where it was coming from. Any ideas?

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Ted Alvarez

Ted Alvarez

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  • Posted on Mar 16, 2014
Ted Alvarez
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Look for hoses with loose clamps you might have missed tightening on.

Testimonial: "No, this is not the case. I changed the radiator, but now it is leaking from the back of the motor, not the front. I'm thinking freeze plug or heater line under the plenum."

5 Related Answers

Anonymous

  • 89 Answers
  • Posted on Nov 16, 2008

SOURCE: Coolant still leaking from my 1996 Isuzu Rodeo.

There is a plastic heater pipe junction behind the inlet manifold against the fire wall that could be brittle and leaking.

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Anonymous

  • 1 Answer
  • Posted on Feb 13, 2009

SOURCE: coolant leak on top of engine behind thermostat housing unit.

on the back of the motor under the plentium the there is a coolant tube with o-rings the go bad found that in mine need to remove plentium and intake off i hade to get the parts from the dealer

Anonymous

  • 398 Answers
  • Posted on Mar 07, 2009

SOURCE: 95 rodeo coolant problems

it could be leaking somewere else , get your cooling system pressure tested at a shop

simontricket

Simon

  • 235 Answers
  • Posted on Apr 20, 2009

SOURCE: White smoke and pressure in radiator.

Any sign of diesel in the water ? sounds like head gasket to me and the engine will rebuild ok but have the dealer put in new injector tube sleeves and O seals .

agent91

Ned White

  • 2100 Answers
  • Posted on Dec 31, 2009

SOURCE: have coolant leak coming from rear of engine i was

It is not the freeze plug but the o-ring gasket at the back of the 23 radiator lines back there, there are 2 that you have to replace, Easy fix, but a nightmare to get to. The o-rings are nothing special, reg off the shelf. It wold be a good idea to take fotos before you start so you can see where everything was when you started, then it should all go back. the intake, dist coils, all the pipes, have to be moved out of the way. You get to clean up that mess back there while you are at it, Good luck.

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How to change thermostat
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    CAUTION
    If the radiator is filled to the top with coolant and the engine is run without the radiator cap in place, the coolant will expand and spill over as the engine warms up.

    • Drain some coolant into a clean container until the coolant level is below the thermostat housing.
    • Remove the upper radiator hose connection from the thermostat housing.
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    • Compare the size of the thermostat to the old one. They are of different sizes, types, and temperature ratings.
    • The temperature rating is stamped on the sensing bulb on the bottom of the thermostat. The temperature bulb faces the block.
    • When replacing a thermostat, be sure that the thermostat fits into the groove in the block or outlet housing. If the thermostat is installed upside down, the engine will overheat.
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    • Reinstall the thermostat housing. Refill the system and run the engine or pressure test to check for leaks.
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    • If the engine is overheating, but the top hose is still cool to the touch, the thermostat is stuck closed and must be replaced.
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Dec 31, 2009 • 1999 Pontiac Grand Prix
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I just changed the thermostat on 3.4 L 1999 Pontiac Gr Am GT THINKING IT WOULD FIX THE OVER HEATING. But there is white steam coming out the exhaust! The oil is not milky so it's not a head gasket. There's...
Are you adding coolant?
Yes ......means it's going somewhere.
Fill the coolant tank to the top...right to the top....leave the cap off and run the engine.
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Read full answer
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