[p_b82]

It sounds to me like there is an airlock, or something related to the pressure in the system. (thermostat working correctly?)

If you've paid a garage to sort out the issue, then I'd expect them to sort out the issue. 4 hours to find and change one piece of pipe is quite steep IMO. Allow them the mileage to give the car a good run - that should solve the "we fixed it mate" type comments, and give you the confidence that they've actually sorted it this time round.

I'm so glad the L-series has ZERO issues when bleeding the system, the amount of coolant I've lost over the years, and had to top it up, I'd have got even fewer miles done than I have lol.

As to selling, I'd honestly say don't be too hasty, I think you've had a really **** run of luck, but I don't believe for a second you've bought a lemon... if your garage can't sort it, maybe organise a "come to my house to fix my car day" or look to get a different set of mechanics to look at it?