woody, same problem here with my 04 4x4 Colorado. The heater/AC only works part of the time. When we were on a trip, I stretched my leg out sorta under the dash and the heater started blowing again.
I haven't had any real serious problems yet. Occasionally, if I am sitting at a stop sign, the brakes will slowly go to the floor, and sometimes my ABS light come on for a minute. My son is trying to change my front breaks now, but the hub wont come off. Anyone know whats holding it on there? We even got a hub puller and it wont budge