Question about 1997 Chrysler Concorde

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Radiator valve not draining

I located the radiator drain valve (a plastic stop-**** type valve), and turned it 90 degrees to the stopping point - but no flow.

Radiator cap is off, as is vent valve on thermostat.

Does this valve need to do something else to flow ? Like pull out, etc ?

Thanks -


Posted by on

  • rjk137 May 17, 2009

    how do you remove it ?

  • rjk137 May 21, 2009

    OK - figured this out - and I probably didn't explain it well enough initially. The 1/4 turn 'petcock' valve does turn, but then has to be pulled outward to drain. It can be removed (as commented above), but to flow in the first place, it has to be pulled out partially. If you look up the replacement part, you can see what it does. This web site removes certain words, so if 'petcock' has 4 *'s in it, thats not from me !

    Thanks for the hints - it got me in the right direction.



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Hi Rob: No special tricks that OI know of, but if there is any seepage it may be restricted by sediment. Close everything up, cap, vet and whatever, then fire up the engine with the drain open. until the blockage clears. Or, remove the whole valve from the radiator. Be careful of hot cookant. Good Luck - Ned

Posted on May 17, 2009

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  • Ned C Cook
    Ned C Cook May 17, 2009

    Hi Rob: No special tricks that OI know of, but if there is any seepage it may be restricted by sediment. Close everything up, cap, vet and whatever, then fire up the engine with the drain open. until the blockage clears. Or, remove the whole valve from the radiator. Be careful of hot cookant. Good Luck - Ned

  • Ned C Cook
    Ned C Cook May 18, 2009

    drain valve is replaceable as a unit. remove whe vavle completely and if still no drain remove radiator cap and try to clear the hole with a pencil or the like. If you have a pressure tester , pressurrize the system That is what starting the engine would do as it warmed up. Again caution with hot fluids. There is no reason for it not to drain with drain completely removed. Some petcocks open by screwing in, not out. consider that.
    Let me know please.

  • Ned C Cook
    Ned C Cook May 21, 2009

    Thanks for sharing that rob. Sorry it wasn't caught sooner.


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  • 41 Answers

If you take that drain plug out it will drain that's what i would do

Posted on May 17, 2009

  • justin barath May 17, 2009

    drain plug will screw out


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I replaced the alternator on my 2003 Range Rover

I Suspect that you have AIR in your COOLING SYSTEM Fallow Procedures BELOW to Insure there is NO AIR IN COOLING SYSTEM

Draining and Filling Cooling System

Draining Procedure

Important: Do NOT add any engine coolant supplement sealant pellets to the cooling system. Drain and refill the engine cooling system every 5 years or 240,000 km, (150,000 mi) , whichever occurs first.

  1. Park the vehicle on a level surface.
  2. Remove and clean the coolant recovery reservoir.
Caution: Refer to Radiator Cap Removal Caution in Service Precautions.

  1. Remove the radiator cap when the engine is cool:
3.1. Slowly rotate the cap counterclockwise to the detention tab. Do not press down while rotating pressure cap. 3.2. Wait until any residual pressure, indicated by a hissing sound, is relieved. 3.3. After all hissing stops, press down on the radiator cap and rotate the cap counterclockwise in order to remove the cap.
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.
  2. Open the radiator drain valve located at the bottom of the radiator tank. If only partial cooling system draining is required, drain enough coolant to perform the procedure.
  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.
      Filling Procedure
      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.
          2. Fill the coolant reservoir with a 50/50 mixture of GM Goodwrench DEX-COOL or HAVOLINE DEX-COOL and clean, drinkable water. Caution: Refer to Radiator Cap Removal Caution in Service Precautions. Important: If the coolant temperature indicator turns ON, turn the engine OFF immediately and allow the engine to cool. Do NOT remove the radiator cap.
          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.

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