i have a 2007 E350 with the 5.4L, and last year I had to add the refrigerant to the system, and that lasted the summer and fall. This year I put about 5 cans in and it was nice and cool for a couple of days, and then it started blowing hot air again. Is there a known area on these vans that are prone to leaks?
Should I start with the schrader valves? IS there a good way to test if those valves are the issue?
Other?
TIA
Jeff
