Car has about 75k miles; Radiator has been worked on, still the reservoir empties in a matter of hours every 3 to 4 days. Been checked for a leak,; been told no leak; Can you recommend an alternative issue with the car
The coolant is leaking externally or internally. A pressure test will show signs of an internal leak. A compression test may show signs of an internal leak and would confirm a blown head gasket.