Well we finally got the car back. The garage have given up with my car just about as much as we have. The overheating light hasn't come back on since we've had it but we now have no heating inside the car 🙈 I've looked on trusty old Google and see a mention of a blocked heater core (which would make sense because the garage said one side is hot, one side is cold). I literally can not throw anymore money into this so I wondered how easy it was to DIY 🤔 we've taken to YouTube to watch videos that make it look easy.