Been a minute, decided to change the 22yr old original Toyota radiator out for a new Denso radiator which looks to be the same as stock. I got new stock hoses and clamps as well as new Toyota Super Long Life Coolant (SLCC) which is bright pink instead of red, so all the red coolant from 10yrs ago needs to exit the engine since it looks more like the blood at the bottom of your pound of ground beef than it does Toyota red coolant. I drained exactly 1 gallon from the radiator and drained some amount from the block drain on the back of the engine while slicing open the back of my hand on some sharp heat shield sheet metal too. Radiator is just about out, no impossibly seized bolts, and if you zoom in on the passenger side you can see my lovely hand crafted aluminum trans cooler lines to the aux cooler hidden under the very ugly cruise control actuator box.
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I just need to figure out how to safely remove the coolant from the heater core, might try to suck it out with my wet/dry vac.
get a gallon of distilled water and about six feet of hose that fits tightly over the inlet and outlet for the heater core. Cut hose in half and attach to inlet and outlet. Then use wet vac or vacuum pump to flush heater core using, one side attached to vac/pump draining into pan, and other side of hose drawing water from the gallon. Suck through about half a gallon, then reverse the process (back flush). You will know by the looks of the drain water if you need to also use a flush cleaner.
If you have city water (low minerals) instead of well, then you can safely use tap water through a garden hose instead, at low pressure, letting it drain into a pan at first to collect the old coolant, than onto the ground once it starts coming out clear. Let it run for awhile, first in the usual direction, then reverse everything to back flush in the opposite direction. Then prime the heater core with coolant using the same hose and a funnel at the inlet side and temporarily plugging the outlet side. Re-attach the heater core hoses and move on to filling the radiator and burping the air.
Remember to raise the front of the car while flushing and replacing the coolant at the radiator, and refer to coolant capacity specs to get an idea of how much old coolant came out. About a month or so later, drain the radiator again and refill, which if done periodically, increases the time period recommended to do full flushes.
The heater core is more fragile than the radiator, so be cautious about the pressure you use, air or water. I don't recommend using a compressor, though.
Might as well put in a new thermostat and gasket, too, seeing how you are replacing the hoses anyway.