Help!!!

There could be a NUMBER of things wrong here. There's not much information to go on in your initial post.

If I had to take a stab in the dark though, it would be this:

You may have a vacuum leak somewhere. A broken hose, something that's fallen off of the port or some similar problem. It would explain the high idle and if running lean, might also explain the elevated temps on a hot day.

Air in the cooling system would explain the high temp reading on it's own but doesn't cover the high idle symptom.


So go over all of your vacuum hosed with a fine toothed comb. Look for anything that's broken or disconnected. A spray can of starting fluid, can help you zero in by spraying lightly around your engine bay and listening for an idle surge. This will happen when starting fluid gets ingested into the motor by any open vacuum orifice.