[stinkerdinker]

I have a 3.4L, 6-cyl, automatic, approx 140,000 miles on it. It had been occasionally overheating, then the red "hot temp(?)" light came on. Took it to a shop they replaced the thermostat and did a radiator flush. It seemed ok for a few days then started sporadically overheating again.

One thing I noticed the first day I brought the van home after the repairs; I shut the engine off it made a "gurgling sound" on the inside of the passenger compartment like it was coming from the heater. It still makes this sound if I've been running the heater.

When this happens the temperature rises very quickly. It can be 40 or 70 degrees out and been driving for less than 5 mins. I've also noticed that sometimes when I put the heater on to try to bring the temp down it blows cold air instead of hot.

There's no rhyme or reason when it overheats, totally sporadic.