My heater valve keeps leaking-I have replaced 6 in 7 months. it mostly happens when running air conditioner

What is your question?

It works for about a month then it starts to leak from the top of the heater control- It has three separate hoses going to it and has a vacuum line connected to it.

What makes this problem better or worse?

it is worse when I use the A/C

How long has your 2003 Ford Excursion had this problem?

7 MONTHS