ok so i have a 2003 a4 1.8t.. leaking antifreeze.. the weird thing is it only leaks when i first drive it. example: drive car to work in the morning, park it, 5 hours later when i go to lunch there is a puddle of antifreeze under car. come back from lunch park my car in a different spot, work for 4 more hours and when i go to leave i notice there is NO LEAK. i took it and had it pressure tested and they couldnt find a leak anywhere and pretty much told me i was crazy. recently had timing belt,water pump and every anti freeze hose that car has changed. im scratching my head on this one.. need help!