Three problems related to engine cooling system have been reported for the 1999 Ford F-150. The most recently reported issues are listed below.
Leaking head gasket @ 101k miles. Antifreeze in #6 cylinder.
I have a 1999 F-150 Ford pick-up truck 4-2l v-6, I was having a low cooleant problem. Took it to mcdonough radiator shop, they replaced water pump and gasket. It was still loosing cooleant. I called the dealership and ask if there was a recall for this vehicle and was told no there was not. I took it back to the same radiator shop after a closer inspection they removed the intake manifold and found water in the back two cylinders. They replaced the intake manifold gaskets, I picked the vehicle up I had not drove more than 3 miles before it started to make a knocking noise. I called the repair shop and took it back immeadiately, now they tell me that I have 2 bent push rods. They are suppose to replace them today. I found out later that I was not the only one having this problem, after some research on the internet I found a web site that has an long list of people with the same complaint. When I called Ford motor company customer "no service" I was told that there had been no recalls on this vehicle for that problem and that they could not help me in any way because of the warrenty had expired. According to jasper engine rebuilders the problem stems from a poorly designed gasket for the intake manifold and that is what caused this problem, got this information from one of their tech bullitens.
Do a recall on the leaking intercooler on the 1999-2000 Ford f150 lightnings.