Keep the valves open when you change the coolant. You don't want to trap an air bubble that might later be released into the system.
I'm in So Cal too, and I do use the heater on cold Saturday mornings going to cars and coffee.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.