zukkev
Cornfuzzled yet again...
When you flushed the core, did you reverse flush it too??? You can put a fair amt of water pressure to them before they split, provided they aren't leaking to begin with...
Try flushing the core again, both ways (pull both heater hoses off at the core....use a garden hose sprayer, flush that bugger out both ways...then hit it each way with air (but be careful, don't just blast it full-on...gradually increase air until the water is pushed out...) Do that a few times (both ways), then hook the hoses back up, leaving the highest connection loose, fill the radiator til you get coolant out the loose hose, the connect it...start and run it to temp, revving the engine every couple minutes to help purge any remaining air...double check the level....should be good to go.
I have had a little chunk of scale act as a door in one of these....took three times flushing it before it finally came out....all is good on it (3yrs running..)
Try flushing the core again, both ways (pull both heater hoses off at the core....use a garden hose sprayer, flush that bugger out both ways...then hit it each way with air (but be careful, don't just blast it full-on...gradually increase air until the water is pushed out...) Do that a few times (both ways), then hook the hoses back up, leaving the highest connection loose, fill the radiator til you get coolant out the loose hose, the connect it...start and run it to temp, revving the engine every couple minutes to help purge any remaining air...double check the level....should be good to go.
I have had a little chunk of scale act as a door in one of these....took three times flushing it before it finally came out....all is good on it (3yrs running..)