It seems I have an issue with the coolant in my vr. Noticed it was just under the min mark last weekend so topped it up to max line,checked it today and there was only about an inch or so left in the header tank. There is no sign of any leaks that I can see and there is no oil/water contamination.I did a little google searching and see that the thermostat housing can cause problems.As I am a total noob to the car any advice of this would be greatly appreciated. Also when I got the car there seemed to be some crystalisation around the top of the header tank,the cap hold pressure but could it be