2004 Lincoln LS no heat and no AC diagnosis

Customer complaint - Air conditioning does work in the summer and heat doesn't work in the winter. Fix it.
Forgot to mention that another shop recommended a control head for over $1000. The customer didn't state if there were other repairs included with this estimate.

I found 2 codes that we want to focus on.
B2797 Driver water valve circuit open
B2799 Passenger water valve circuit open

Both of these water valves are built into one assembly and share a power source. That power is supplied by a 10 amp fuse under the hood.

I found that fuse was blown, let's find out why.

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