Sorry for two posts from the new guy, but I also had another problem:

Possibly connected symptoms:

Cruise control doesn't work, AC/Heater/Vent blows only out of defroster and floor vents, brakes a little spongy, hard starting when engine is cold.

I know all those are symptoms of a vacuum leak/problem. This morning, the brake light on the instrument panel came on, though the brakes still seem to be operating well enough. That light is intermittent, by the way. In the 5 years I've had the Blazer, the brakes have always seemed to grab a little too hard.

I guess my question is, where would you guys start trying to track down a vacuum leak like that, and do you in fact agree that it's probably a vacuum leak?

Thanks!

 

what year blazer check for vacuum at the cruse control by pulling the vac line off and listen for changes in engine rpm it is on the left inner fender by the brake abs on a 95 not sure on anything newer start there for your vacuum leak with the brake light on it sounds like a brake problem maybe a leaky caliper or wheel cylnder