Stop g2 from auto connecting to certain WiFi?

[olivierm]

When I am at home my cars WiFi ap (allows remote start of the heating) competes with my home AP. My phone often connects to it. Problem is that of course, my car doesn't provide internet access. So I usually have to manually connect to my home WiFi. I can't see any option setup of WiFi networks to specify which ones it can auto connect to. Any idea ? Phone is not rooted. Thanks