overheated in -20 weather

[someotherguy]

6.1 Hemi water pump housing has a bleeder built-in. It's an allen head plug that is usually seized by the time you need to use it, so it rounds out instead of loosening. I beat mine to the punch by installing this sweet Swagelok stainless bleeder valve, just turn the cap. They really do need the bleeder though as apparently the reservoir cap isn't the highest point in the system.

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Richard

 

[El Tigre]

I installed my own "bleed" screw on heater hose connection on intake. Unbelievable amounts of air come out when refilling coolant.

 

[Schurkey]

Or just install a Robertshaw thermostat, that has a stamped air-bleed. Makes for easier cooling system service since air readily passes the closed thermostat, but very little coolant would flow. That way, engine warm-up is essentially unaffected.

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Unless your head gasket leaks, or you have a cracked casting, there is no air in the water jacket of the engine two seconds after the thermostat opens for the first time after cooling system service. All the air is now in the radiator, where it's seen as "low coolant level".

 

[Frank Enstein]

Yeah! What he said!

 

[HotWheelsBurban]

6.1 Hemi water pump housing has a bleeder built-in. It's an allen head plug that is usually seized by the time you need to use it, so it rounds out instead of loosening. I beat mine to the punch by installing this sweet Swagelok stainless bleeder valve, just turn the cap. They really do need the bleeder though as apparently the reservoir cap isn't the highest point in the system.

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Richard

Yep that seems to be a Mopar thing. My old Intrepid with the 3.5 had one in the water outlet, and it was definitely necessary! The factory manual recommended using a long piece of vinyl tubing to bleed the system with.

 

[El Tigre]

Old school Chevy thermostats DO NOT work on Vortec 5.7 motors.
They REQUIRE the two-stage type like the 5.7 LT1 motors like these pictured.
One is MotoRad ,and the other is Mishimoto... Either one is fine..

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[Schurkey]

Marvelous. Buy one that fits, that has a ***TINY*** air-bleed like the one shown in my example.

For ****'s sake, DO NOT drill bigass 1/8" hole(s) in the flange.

 

[smdk2500]

Some cars have cooling systems that trap bubbles; and they generally have bleeder valves on the high spots. These trucks don't.

I don't want to correct you because 9.9 times out of 10 you are correct but I am this time. "Some" of these trucks do have bleeders. The 6.5 platform has them on the t-stat housing.

 

[El Tigre]

Be nice if we could all be talking about the same motor ,huh...
Assuming poster is referring to a 5.7 Vortec ,but maybe not....

 

[Schurkey]

I don't want to correct you because 9.9 times out of 10 you are correct but I am this time. "Some" of these trucks do have bleeders. The 6.5 platform has them on the t-stat housing.

Valid point, if he has a diesel.

Be nice if we could all be talking about the same motor ,huh...
Assuming poster is referring to a 5.7 Vortec ,but maybe not....

I looked through this thread twice. The original poster has never bothered to mention which vehicle, or engine, he has.