If you don't me saying, what would put me off is:
- "no expense spared" ; I read that as the car has had lots of things wrong. I would not want to buy a car that has had loads of issues.
- The cooling question as above. If it confuses me, I am sure that it confuses potential buyers. They may think there is an issue with the car (overheating), and as a potential fix an attempt was made to replace the cooling system. Issue may or may not still be there.
Just my 2p after reading the advert and not getting that "I want to buy the car" feeling because of the wording.