Question about 2000 Pontiac Montana

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Draining the Engine Block of Coolant.

3.4L V6 engine in a Pontiac Montana. I want to drain the coolant from the engine block. I could use help locating the drain plugs, please.

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  • Joseph Poniatowski
    Joseph Poniatowski Mar 01, 2009

    I have already drained the radiator. I want to drain the engine block of coolant directly from the drain plugs on the engine.

  • Joseph Poniatowski
    Joseph Poniatowski Apr 01, 2009

    The other plug is on the back but was only accessable with the van raised on jackstands. Basically I found it while disconnection the rear exhaust manifold. While looking up from underneath towards the rear of the engine shine a flashlight up there and you'll see it. I had to use a long extension on my ratchet.

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The drain plug is under the front of the truck on the drivers side back of the radiator. you have to turn it to open it .

Posted on Mar 01, 2009

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  • 4 Answers

One of the block plug is on the front between the oil filter and starter. the other one, i'm looking for it too!

Posted on Mar 31, 2009

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102900_tstat_2.jpg

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    Important: Recover and store used coolant in a used coolant holding tank and submit the used coolant for recycling on a regular basis. Do NOT pour used coolant down the drain. Ethylene glycol antifreeze is very toxic. Disposing of ethylene glycol into the sewer system or ground water is both illegal and ecologically unsound.

    1. Place a drain pan under the radiator drain valve in order to collect all of the used coolant.
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    3. Open the air bleed valve on the thermostat housing 2 full turns
      1. Open the air bleed valve above coolant pump 2 full turns.
      2. Place a drain pan under the engine block drains in order to collect the used coolant.Important: Allow the coolant to drain completely.

        1. Remove both of the engine block drains.
          • The front left engine block drain is located between the starter motor and the engine oil filter.
          • The rear right engine block drain is located near the crankshaft position sensor.
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        Reinstall the engine block drains
      3. Close the radiator drain valve,
        1. Install the coolant recovery reservoir. Notice: When adding coolant, it is important that you use GM Goodwrench DEX-COOL or HAVOLINE DEX-COOL coolant. If Coolant other than DEX-COOL or HAVOLINE DEX-COOL is added to the system the engine coolant will require change sooner; at 50,000 km (30,000 mi) or 24 months.
        2. Slowly add a 50/50 mixture of GM Goodwrench DEX-COOL or HAVOLINE DEX-COOL and clean, drinkable water to the radiator until the coolant level is at the base of the radiator fill neck.
        3. Wait for 2 minutes and reinspect the level of the coolant in the radiator. If necessary, add coolant to the radiator until the coolant level is at the base of the radiator fill neck.
        4. Install the radiator cap.Ensure that the radiator cap arrow points toward the radiator overflow tubeImportant: The air bleed valves are brass. Do NOT over-tighten the air bleed valves.

          1. Close the air bleed valve above the coolant pump.
            1. Close the air bleed valve on the thermostat housing.
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            3. Start the engine and allow the engine cooling fan to cycle on and off 3 times. If the low coolant indicator does not turn OFF and the coolant level is above the Full Cold mark on the coolant recovery reservoir, refer to Engine Coolant Temperature Gage Inaccurate or Inoperative.
            4. Turn off the ignition.
            5. Allow the engine to cool.
            6. Ensure that the engine coolant concentration is sufficient.

    Feb 21, 2009 | 2001 Pontiac Aztek

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