Hi i had my car serviced tuesday and they have noted that i have a problem with the thermostat seal causing a leak. However i have never seen any coolant on the ground or engine bay? and have monitored my coolant on a weekly basis so I decided to leave this and not get it fixed.

Does anyone know if this crystallises? Just wondering by me leaving this will it have a costly $$ effect in the next few months if i dont get it fixed?

Can anyone do a second opinion test on my car for a free inspection?

How much approx would someone charge for me to fix it?