Question about 2004 GMC Sierra 1500 Crew Cab

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2004 GMC Sierra 1500 Vortec 4.8 Liter leaking coolant from rear side of engine on drivers side. Engine runs smooth, no water in oil. Is it a freeze plug? Where are they? I don't have to take the engin

Water runs from underneath engine above oil filter and comes pouring off of transmission. Tried 2 Barrs Leak for Heater Cores,...Stop for a few minutes then started again, slowly then pours out again.

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Personaly I would take and have pressure tested, I would say most likely a freeze plug, GM is bad about replacing them, May cost around $100, It depends on what freeze plug is leaking.

Posted on Nov 26, 2014

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I realize it may be a pain, but, you really need to find where the leak is located? Can you feel around the top of bell-housing when problem is ongoing? Maybe there is a gasket problem of some kind? Sometimes, I use a mirror in places where it is hard to see, shine a flashlite or drop lite into the mirror, maybe a little lite back there will help?

Posted on Nov 26, 2014

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Sounds like you have a freeze plug, some call it a frost plug that has rusted out. Very inexpensive to fix yourself.
Watch this video.

Posted on Nov 26, 2014

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Most likely is a freeze plug there is more then one n therein a row most times front to back ur looking on the block of the engine they r round maybe 2 inches around they set up in a little bit they r metal but if it was replaced once before they can be a white rubber n i recommend thats what u replace it with if u never done it before thats the way to go good luck hope this helps u if u dont know wht they look like google an image of them and it will give u n idea what ur looking for there might even be a video on youtube showing u how to change them

Posted on Nov 26, 2014

NEVER NEVER put any stop leak in any vehicle component

Next your heater core will be plugged, if not already & then
the radiator as well

You CAN NOT get that stuff out once it is in there

Your asking if it is a part we can not see from the internet

Think about how we perceive these questions

I it is a freeze plug, look yourself,only you have the problem
& the vehicle

If we say yes it is--& it is not-- then what?

Where they are-- if they even exist-- should be in a picture of
the block on the internet

If you not a car kind of guy with experience, you should take
a different vehicle to a repair shop & just talk about it there

Posted on Nov 26, 2014

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Posted on Jan 02, 2017

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SOURCE: Ihave a 2000 gmc sierra that has a oil leak down

check for 2 steel cooling lines going to the radiator for leaks at the transmission....but more than likely the oil is coming from the valve covers...if you fix it use the rubber gaskets. if it doesn't leak much just hose the tranny once in a while for it is a rough and it is expensive undertaking at a garage.....it pro is not the rear main seal-which is also not a picnic....keep a check on you eng oil level.....luck to you

Posted on Feb 26, 2010

riceski
  • 1851 Answers

SOURCE: do i have to remove transmission to replace freeze

Usually you can get rubber freeze plugs and if the freeze plug that is in the very back is leaking you will see the water coming from between the bellhousing and block - just be sure it isn't leaking above that and just looks like it is coming from the freeze plug between the block and tranny.
I would for sure check with a local mechanic first and let them see if it is just a heater hose or something above it. Usually a freeze plug goes for life.
Thanks for choosing Fix Ya

Posted on May 26, 2010

  • 266 Answers

SOURCE: I have a 2003 gmc

ONLY A COUPLE OF PLACES WILL LEAK UNDER PRESSURE OIL COOLER LINES FROM ENGINE TO RADIATOR, OIL FILTER , AND OIL PRESSURE SENDING UNIT IN BACK OF ENGINE BEHIND INTAKE MANIFOLD

Posted on Oct 20, 2010

  • 9 Answers

SOURCE: Late 1999 4.8 Liter V8

ID BE LOOKING AT THE HEATER CORE FOR LEAKING. YOU MIGHT PRESSURE TEST IT FOR AN HR. YOU WILL MOST LIKELY FIND THE LEAK.:)

Posted on Dec 31, 2010

  • 14036 Answers

SOURCE: I have a 1988 GMC Sierra with an

SOUND LIKE BACK FREEZE PLUG ON BACK OF CYLINDER BLOCK.CHECK MAKE SURE YOUR HEATER CORE HOSES NOT LEAKING COOLANT.ON BACK OF ENGINE.

Posted on Mar 06, 2011

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The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the ECM. The ECM supplies 5 volts to the coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the ECM monitors a high signal voltage which it interprets as a cold engine. As the sensor warms (internal resistance low), the ECM monitors a low signal voltage which it interprets as warm engine.
0900c1528008f125.jpgFig. 1: View of the Engine Coolant Temperature (ECT) sensor 0900c1528008f126.jpgFig. 2: Engine Coolant Temperature (ECT) sensor locationTESTING
See Figures 3 and 4
  1. Remove the ECT sensor from the vehicle.
  2. Immerse the tip of the sensor in container of water.
  3. Connect a digital ohmmeter to the two terminals of the sensor.
  4. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration.
  5. Repeat the test at two other temperature points, heating or cooling the water as necessary.
  6. If the sensor does not meet specification, it must be replaced.
0900c1528008f120.jpgFig. 3: Intake Air Temperature (IAT) and Engine Coolant Temperature (ECT) sensor wiring diagram 0900c1528008f095.jpgFig. 4: ECT sensor temperature vs. resistance values

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