Quote:
Originally Posted by DeliveryValve
The threads on the cooler fittings don't strip upon removal. It only strips when the installing the cooler lines by force threading them.
What can happen upon removal is the fitting breaks free from the cooler when trying to loosen the lines. Try to get a wrench on both the cooler fitting and cooler line to prevent this. And PB blaster as Kerry noted.
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X2
The damage is most likely a wrenching of the threaded portion from the casting whilst undoing it. The nuts on the unions seem to be much tougher than the weak aluminum alloy oil cooler casting.
My recommendation is to take your time and get as much access to the lines as possible. If you happen to be replacing the lines I'd go so far as to say cut through the old lines and make one heck of a mess and then remove the oil cooler from the car before tackling the unions. In that way you know you have as much access as possible.