Overheating on the highway. 76, 2.0 Options

[SVG223]

My 914 overheats on the highway. I had concerns about the air flap, but I think the thermostat has broken and it stays in the open position. I thought something might be clogging the fan but it looks clear. I wonder about the heater air hose that goes over the motor. It could be blocking some air possibly. I may try to tie it out of the way. After exiting the highway and stopping at a stopsign the idle was extremely low, I was surprised it was still running. I turned the engine off for a while and it ran better after it cooled down. Any ideas would be appreciated.

[Superhawk996]

Did it actually go into the red zone? If not then it technically is not overheating.

How long did it take to get to that position?

I see that you are new to the World. Is the car new to you, do you have history with the car ? . . Has it run much cooler in the past and a rapid surge got your attention?

Is the timing set properly?

[SVG223]

Did it actually go into the red zone? If not then it technically is not overheating.

How long did it take to get to that position?

I see that you are new to the World. Is the car new to you, do you have history with the car ? . . Has it run much cooler in the past and a rapid surge got your attention?

Is the timing set properly?

I don't think it quite made it to the red zone, it almost touched it. While it was still hot the idle was 200 rpm it's normally 1000 rpm. I'm guessing loss of compression from the heat, don't know.
It took about 20 minutes.
The car is new to me, got it in winter.
I just had the valves adjusted, not sure if he checked the timing.