High speed, higher temperature?

[rubi]

Some cooling systems are extremely difficult to purge of air pockets after refilling, flushing, etc. Can you hear any gurgling? On a cool engine, try disconnecting the highest radiator hose and check for air inside. You can try to refill it before you reconnect it.

My car also had "Fin Rot" (not to be confused with Rotten Finns) once and the radiator lost cooling capacity. It showed as higher temps during highway driving. IF I dropped 10 mph, the temperature came back down. Running the heater also brought the temps down, well, engine coolant temperature. Running the heater in July didn't help my temperature any.

Oh yes there is gurgling!

[LHOswald]

thats what she said

[fa22raptorf22]

thats what she said

No. That is what she was doing LOL.

But really. When your car is cold. Open the radiator cap and let the car idle.
Put the fan to medium and heat to full blast.

As the fluid goes down, slowly add some. You can stop when the level is at the brim and not going back down. This is like a 5 minute process.

While still idling, cap it back off and squeze the tube coming off the cap a few times to purge it.

Then turn the car off and fill the reserve tank to the full line.

Then you should have no more gurgling.

[rubi]

Agh

Thanks fa22raptorf22

[fa22raptorf22]

Agh

Thanks fa22raptorf22

Did that work for you?

[padauk_dust]

Also on some cars there is a special bolt - usually near the thermostat housing - that when loosened will achieve the same effect. It will allow the air to escape. Just loosen it until there is a solid stream of coolant coming out. Not sure if this would apply to your car, but there you go, an additional method. These methods may be combined to achieve THE ULTIMATE PURGING of your cooling system.

[Rope-Pusher]

Also on some cars there is a special bolt - usually near the thermostat housing - that when loosened will achieve the same effect. It will allow the air to escape. Just loosen it until there is a solid stream of coolant coming out. Not sure if this would apply to your car, but there you go, an additional method. These methods may be combined to achieve THE ULTIMATE PURGING of your cooling system.

General John (Black Jack) Purging?

[rubi]

Agh

Thanks fa22raptorf22

Did that work for you?

Yes, thank you...

[fa22raptorf22]

Also on some cars there is a special bolt - usually near the thermostat housing - that when loosened will achieve the same effect. It will allow the air to escape. Just loosen it until there is a solid stream of coolant coming out. Not sure if this would apply to your car, but there you go, an additional method. These methods may be combined to achieve THE ULTIMATE PURGING of your cooling system.

Right. The thermostat bleed screw.

But actually there is another method of bleeding that I think is more ultimate.

Its called the themostat cross drill.
You drill a small hole through the therm flange, which allows the system to bleed itself, all the time.

[Rope-Pusher]

Also on some cars there is a special bolt - usually near the thermostat housing - that when loosened will achieve the same effect. It will allow the air to escape. Just loosen it until there is a solid stream of coolant coming out. Not sure if this would apply to your car, but there you go, an additional method. These methods may be combined to achieve THE ULTIMATE PURGING of your cooling system.

Right. The thermostat bleed screw.

But actually there is another method of bleeding that I think is more ultimate.

Its called the themostat cross drill.
You drill a small hole through the therm flange, which allows the system to bleed itself, all the time.

Eh Governor, your a bleedin' genius! Drill/locate the hole so it is toward the top for vertically-oriented thermostats.