I did not notice any smoke, but I wanted to get the heck out the the intersection, too! By the time I got to my son’s school (15 minutes in light traffic) though, there was no smoke.
As for stall, what happened was like this: I came up to the light, sat for a few seconds and then the engine wend “put-put” then cut out completely. I paused for maybe five seconds, turned on the ignition. As I turned the key, there was a sharp brief sharp squeal, then nothing. I thought for a moment that the engine must have catastrophically failed. As a last ditch, I turned off the air conditioner and blowers. The engine immediately came back alive, and actually ran smoother than when the air conditioner was on. Under the hood, there is a slight sound that seems like old bearings or something, so I figured that it was air conditioner-related. My working theory was that when the air conditioner was seized up in such a way that when enabled it drew too much for the starter to turn over.
I told this to the guy at the shop, it was at a dealership so I think he was more just a “car guy” than a certified mechanic, and he didn’t seem to understand my theory. I poked around online, and couldn’t find anything that fit, so with a coolant leak, I assumed it had to be a hydrolock issue.
I guess we’ll see. If it turned out to be a failed hose and the air conditioner is still working it still could be water if the intake manifold is sucking in coolant from outside the engine. I think I might have had a very slight rough idle in a car wash before completely sealing up the cowling (there is a clip that I ran some silicon over to prevent it from dripping), but I thought I was being paranoid. The intake manifold gasket will be replaced no matter what eventually. If it’d a head gasket, I guess I’ll be doing that sooner than later.
Wife reported that the truck ran fine after work, but, she doesn’t keep a good eye on the gas gauge, nevermind the thermostat! Before though, never overheated. I keep a close on on engine temp and the only time it snuck above normal operating temperature was in the mountains, on dirt with the air conditioner on. And even then, it held within rang. I turned off the air all the same, enjoy that woodsy air!