(Intermittent) coolant leak?
I know from previous experience that the car (MINI R55 2008) runs hot, about 218-220, but it was spiking to 240-250 (even saw a 260 briefly). So I limped home, put about ~ 1 gal of diluted AF in it, then started it up and revved to get the tstat open, then topped it off as the system filled. I then sat in the garage and revved it to 3k (about where it runs on the highway) for about 10 mins and the temp maxed at 218 as predicted. I did this twice. I would have taken it out on the road but I had DD @ home and didn't want to strand her out with me.
That was yesterday (Sun) PM; I let the car sit in the same place overnight and the liquid level in the tank hasn't changed. I'll probably take the car out tonight once I get home from work (borrowed a car from the FIL).
So I was talking with the FIL, who took care of our house while we've been gone and he said that he noticed a leak, but couldn't give specifics other than that it seemed to get worse when the car was running (he only turned it on to move it to mow the lawn) He forgot to tell me about it when I got back.
So - car is fine for the longest time, sits for 25 days where all the coolant drains out, so I fill it back up and AFAIK there is no more leak. FWIW I did have the water pump changed out a few years ago (when it failed it was pretty obvious, sudden big puddle on the ground).
So I am soliciting thoughts on what went wrong - could the car just sitting around for 4 weeks (more or less) be the cause here? FWIW I've never really had issues with coolant, I don't recall much if I've ever had to top it off.
I have a digital borescope I'll try and poke around later today to see if there are any obvious leaks, but other than that I might just start driving it and monitor.