Hi, I have a 2002 F150, 4.2L that is leaking coolant. I thought it was coming from the waterpump and had that replaced but it is still leaking. The mechanic insists he has pressure tested it and isn't finding anything yet I have a puddle of coolant under my truck every morning and my coolant level is down about a 1/4 " after eachieve use. It looks like it is leaking from a couple bolts. But the mechanic claims he would see it leaking when he pressure tests it and he isn't seeing anything. Can anyone help me?

 

Either the mechanic gave you a water pump you do not need or is incompetent.

Leave the truck with them overnight. Once they see the leak, tell them to find/fix it!