All power locks not working

[bphall74]

I have a 2004 Endeavor and for many years now the power locks only work in the winter months for some weird reason. All 4 doors and the lift gate locks don't work by using the door button or the keyless entry/alarm buttons. Typically when it begins cool down, late October-early March I'll have no problems getting in and out of the vehicle with the buttons working fine. As soon as it begins to get warmer and warmer, they become intermittent and then in the summer months, they don't work at all. I told this to the manager of the body shop I was just at while getting some repairs done and he's never heard of it. I've google this and have come up with a few suggestions, but nothing that seems to fit exactly. Any ideas?

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