Q: Coolant/radiator 2000 Volvo C70

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Old radiator had small crack in it. But had no problems except replacing coolant frequently. Replaced radiator a week ago. Drove fine for a few days (about 300 miles). Then ran hot. I immediately pulled over before it got in the red. Coolant was coming from lid on reservoir. I replaced lid. It started sputtering while idling. As i pulled into driveway the hose going to thermostat busted. Replaced hose and thermostat. Bled the air out only way i know how. Its constantly losing coolant. Cant find where its leaking. No coolant in oil. No oil in coolant. Please help

My car has 129000 miles.
My car has an automatic transmission.

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