2007 Western Star 4900 Mechanic issue

Got an engine overhaul on my 07 Western Star 4900 on August 25, 2016. It was on Warranty but by a third party and it was hell to get them to cover but they agreed to pay 7000 of total. Today I had to stop the truck because it start eating 2 gallon of anti freeze and at the beginning of the week and presently it has escalated to three gallon every 100 miles. I want to take it to Freightliner were they did the overhaul because I suspect is something with their work but I am afraid they might want to stick to me and push another issue... Maybe the turbo, EGR or something. I do not know we're the anti freeze is going as their is no leak... The shop is a Freightliner dealer and the only way one near me but they have very bad reviews and they took two months with my truck when they did the overhaul any suggestions on what to do. Please advise.

 

Sxdime, the driver reliaze the consumption of antifreeze while on the road inspection 350 miles from terminal. Since he never over heated he continued to put anti freeze until he reached its destination. We are from southeast Florida. He never saw an over heat message on dashboard and driver put antifreeze as soon as he realized it was low as he stopped at 100 miles just to check. Truck is now parked at terminal. The engine is a Detroit 60 Series. Hopefully, we didn't messed with warranty. Taking it to the mechanic on Monday but I thought of posting just to get second opinion as I doubt the mechanic will admit to any wrong doing.

 

If it's the EGR cooler how much does repair cost?

 

Update: Took the truck to the Freightliner were I got the overhaul and after a day in they called and said that it was some loose clamps by the EGR and that they changed the radiator cap and send me on my way after paying the 550 bill; I find that incredulous. They assured me that they did all the test and found nothing.

On my first trip now headed to NY... Wish me luck. :-/