Trans fluid in my coolant

[Tony@AirRideTech]

Sounds like the core blew out in your radiator.... you will need to pull the pan on the tranny too and change the fluid and the filter.

[p_rubottom]

Thanks Tony, I do have a new radiator that I'm installing tonight. Im just wondering the best way to get the trans fluid out of the cooling passages in the block and water pump? I dont want to install the new radiator and fill it with left over tranny fluid/antifreeze thats still in the block.

[nico]

Install the new radiator and attach the lower hose, put a garden hose in the cap opening and leave the top hose loose... Fill the radiator full of water and start the engine, when the thermostat opens (if you didn't remove it earlier) it will pump all the water, fluids and trash out of the engine. I'd just let it run and flush everything out for several minutes.

I would think the heat from the engine will loosen the trans fluid enough for some regular radiator flush to scrub it clean.

I followed the same basic procedure when we switched my 1997 from Dexcool to regular green antifreeze.