Radiator Drain Plug? Coolant wont drain - JeepForum.com
 
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post #1 of 7 Old 03-15-2007, 06:46 PM Thread Starter
epfriis
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Radiator Drain Plug? Coolant wont drain

I have a new thermostat that im trying to install. I have the Haynes manual and it says the open the radiator drain plug on the bottom right of the tank. It seems to only turn 90 deg, and nothing comes out. Thinking maybe it needs a vent up top, I took off the radiator cap-still nothing. Can someone please tell me how to drain this coolant enough to install this thing. Im trying to avoid taking off the lower hose.


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post #2 of 7 Old 03-15-2007, 07:30 PM
BlackShuck
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Valve

I just replaced the water pump on my I-6 this last week. And I don't remember the exact events, but basically I pulled the little drain hose from the clip and turned the valve (which started a little flow for me) but it seems like you can work the valve out of the radiator a little bit, and that allowed it to drain better. I guess you could also just remove the thermostat housing as is and replace the thermostat. I believe that you will lose coolant out of there regardless of whether or not you drain antifreeze from your radiator.
I replaced my thermostat also, even though I didn't know if the old one was functioning properly or not. I test both the old and a new one in hot water on the stove and neither of them responded the way that they should have. (according to service manual specs)

P.s. what made you decide you needed a new one? What symptoms?
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post #3 of 7 Old 03-15-2007, 07:30 PM
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Turns 90 degrees then pulls out - pull hard. Channel locks work well.

Jim Karlin
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post #4 of 7 Old 03-15-2007, 07:34 PM
Vestjam
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Quote:
Originally Posted by FPKites
Turns 90 degrees then pulls out - pull hard. Channel locks work well.
Agreed... Put your back into it.

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post #5 of 7 Old 06-18-2015, 09:17 AM
Tumbleweed1954
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Thanks for this info!
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post #6 of 7 Old 06-18-2015, 12:15 PM
mikem350
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What I do rather than mess under the jeep. If you have a small piece of hose, like 5/16, push it down into the radiator filler hole. Wiggle to get around the trans cooler in there. Clear vinyl tubing works good, so its easy to syphon. Don't need to drain much.

The rad drain tends to collect rust and debris, so pull the plug out and maybe fish a wire thru

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post #7 of 7 Old 06-18-2015, 12:18 PM
mikem350
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[QUOTE=BlackShuck;3460061] I test both the old and a new one in hot water on the stove and neither of them responded the way that they should have. (according to service manual specs)
QUOTE]

Not unusual, its hard to get stove water hot enough. Stats START to open at 195...

Try it with a 160

Proud owner of two 4.0 Laredos
Red 94 mint!
Silver 98 w/263k runs like new!
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