Evening guys and gals ,a stupid question this might be but please bear with me ,having an issue with heater going cold when on idle so checked the coolant level tried to take off filler cap and only the cap comes off leaving the bottom part of the cap still in tank ,thought a bit strange so used screwdriver ag mole grips to remove and then top up tank,had a look on eBay and the photos only showed the top ,my question is this normal as can't see having to use tools to remove top up being correct as every other car have owned the cap was one piece ,thanks