UK Auto Repair Questions?
How much does it normally use or how often do you need to top up?
I take it you havent noticed any leaks when parked up after use etc?
What are the footwells like in the car..do they feel damp or wet at all?
Thats fine..just ignore that phone request.you wont get charged for that..
The car.. what id likely advise given what you have carried out already..is to get the coolant system pressure tested..this means adding pressure to the system and then see if it holds that pressure or not or if it forces said leak to appear..very often in cases where you find it difficult to trace leaks..then those kind of tests need to be done..other than sticking some UV dye into the coolant system and run the car for while until the level drops..then go over the whole coolant system with the black torch and glasses to trace the UV dye itself..that will for sure id your leak..externally.. however it wont if its small leak on the headgasket..a compression test on all cylinders might well do
If the headgasket has gone..then compression test would likely show that up.. Without dismantling anything if you know a garage who has decent scope then they can do a relative compression test.and see which cylinder peaks are low..... unless the ignition coil is going bad or arcing which can be common on those petrol engines..maybe pull the sparkplugs and inspect them aswell as the igntion coil boots for corrosion or any signs its been arcing to the cylinder head...But as far as the coolant loss problem is concerned..you need to get it properly tested..you've obviously done as much as you can on a diy bases..
Your welcome - glad to help