Why is my truck overheating at highway speeds only?

I followed your recommendations and found nothing out of spec the only problems I have left is a noisy 5 speed manual that is full of fluid, a few steering components that are worn and no air conditioning I have almost completely rebuilt my truck mechanically speaking that is why I am confused about what is causing me this issue.

When to rev up the engine to see if hoses collapse?

Do this by allowing the engine to be fully warm, then while looking at these hoses, rev the engine up to around 2000-2500 RPM (or have someone do it for you while you observe the hoses). What you are looking for is to see if one of them collapses. What happens is, as hoses get old, they weaken and can collapse under higher engine speeds.

What should Highway temp be at highway speed?

I used a bluetooth OBD II connector to monitor the temp at highway speed. It runs 212-214F without the cabin heat/blower on, and if it’s warm outside (65F+), and I leave the cabin heat off it slowly rises into the 240F range which pushes the temp gauge up close to red.

Why does my Outback Sport overheat on the highway?

My 2003 Outback Sport has had an overheating problem since the weather has warmed up (2 months/ 3k miles). At highway speed (60+) after 10-15 minutes of driving the temperature will slowly creep up. I can reverse this creep by simply turning the interior temp gauge to hot, but it drops faster if I turn on the blower as well.

What causes the tach needle to bounce while driving?

And after the TC engages around the 60 km/h, like it’s designed to, the tach will drop somewhat to where it should be. Again the bounce of the tach needle occurs if I duplicate the little to no torque, steady speed. Generally between 62- 79 km/h.

Why is my Jeep Cherokee overheating at low speeds?

Your engine may be able to stay cool at low speeds because it’s not working that hard, and therefore not creating as much heat. When you hit highway speeds, however, your engine needs a lot of coolant flowing through to keep it cool. If the thermostat doesn’t open, there isn’t enough flow to keep things cool.

When does it get hot on the highway?

Thank you for your time around town it’s fine in 110 plus degree weather only on the highway around 70 ish mph for more than 15 miles is when it starts getting hot however when stuck in stop and go traffic it runs perfectly cool so I’m stumped. This says your dealing with a circulation issue.

Why is my truck overheating at highway speeds only?