Could just be a hose. I did a coolant flush last year and recall it being a ********************. You cant drain it all from the front. There's like 5 hoses iirc around the engine that you have to pop off then put back on for like 2 or 3 flushes. There's a good video on it from some British guy on youtube.
Also, you can find cheap old oem rads on ebay with potentially low miles if you're feeling cheap
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