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Old 05-12-2016, 07:10 AM
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How to get coolant to drain?

I plan on changing the coolant this weekend. Again . Because it really didn't want to drain last weekend. The engine was warm but I'm thinking the T stat was not open maybe? It seemed that only the radiator drained because I only got half a gallon and I know there is a lot more in the engine. All other cars I have done were fairly quick to drain. Have any of you found a trick to get the block to drain? Maybe make sure the engine temp is >180 to open the stat?
Disclaimer: Yes, I know the system is under pressure when it is hot. I have a method and device to relieve pressure before opening the drain. Not my first rodeo

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Old 05-12-2016, 10:27 AM
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Re: How to get coolant to drain?

and thats all you are going to get from the radiator.

on old cars we would remove lower hose from rad and you can get more out, some from block.

still not all.

it needs a FLUSH to replace all.

take it somewhere you trust. they can do a good flush. then bring them the correct antifreeze for you jeep. dont expect that the generic green stuff they have meets spec.
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Old 05-12-2016, 09:46 PM
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Re: How to get coolant to drain?

Ha, no. Trust myself more than any shop for this or any other regular maintenance item. They don't have any special widget that I don't for it.
I'm betting the key is to break the vacuum that the stat causes when it isn't open. Much like on my online 6. It dropped 2 gallons when I opened the housing.
My plan is to put the test cap on tomorrow and drive it up to 200* before opening the drain. The stat will definitely be open then.
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Old 05-14-2016, 07:05 PM
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Re: How to get coolant to drain?

Yep. That was the problem! Got the coolant temp up to 203 and the floodgates opened when I drained it. Just about 3 gallons plus what pushed into the overflow. The 0 psi cap helped so there was no pressure in the system.
Took an hour plus the time to dump the old stuff in the lake.....er, recycling facility
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