rick66

I am installing my new DeWitt radiator. I intend to use Zerex GO5 antifreeze. How does one evacuate ALL the old antifreeze from the block? Will the lower radiator removal do it?

Thanks in advance for your help.

wmf62

flush it out with water, either by hose or by draining and filling till it is all gone. if you have them, remove the drain plugs from the lower side of the block.
Bill

ps: there are flushing fittings that can be installed in a heater hose that will help when trying to flush with a garden hose.

mikem350

If you get lucky the block drain plugs will come out..do not use a 12 pt socket if they are hex!

If u just remove the lower hose the block won't get drained

Powershift

As others have stated, remove the lower ignition V-shields and then remove the block drain plugs. Use a little Kroil or equivalent and then use a good 6-point socket and a 1/2 drive breaker bar. If the holes are plugged, use a screwdriver and remove the rust/scale until the coolant drains out. Then flush through the block with a water hose and let everything drain. Then re-install the block drain plugs and V-shields. Use anti-seize or teflon paste on the block plugs to seal and assist in removal if needed in the future. Then refill with G-05 and distilled water.

If you don't want to do this, then get about 10 gallons of distilled water from the grocery store. Fill the block and new radiator (about 2-3 gallons), run the engine 5-10 minutes, let cool, and then drain through the radiator. Repeat a few times until the liquid from the radiator drain is clear/clean. Then fill with G-05. Do not use the 50/50 mix since you will already have distilled water in the block.

Also make sure you have a 180 F thermostat installed.

Larry

MikeM

I would remove the thermostat and put the housing back on the engine, remove the block plugs and fire the engine up and let it run until it was all clear water coming out the block.

Take the heater hoses off and use a hose to flush the heater, both directions a couple times and then hook the hoses back up. THEN, I'd remove the old radiator and install the new one along with a new thermostat and fill the system while the engine is running.

rick66

Thanks for all your help guys....I love this forum.

Dan Hampton

Find a shop that has a Exsol or Quik Draw coolant exchange machine. That way you extract all the excess fluid and air out of the system and refill it with 100% coolant. It takes about ten minutes.

Powershift

Dan:

That's no fun!!

Laying on your back, with coolant running down your arm(s) and the distinctive taste of ethylene glycol in your mouth is what makes the hobby enjoyable.

Everyone needs to do it at least ONCE just for the experience.

Larry

63 corvette

I will never forget the taste of that stuff!