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Exhausting Air From Cooling System-How?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Mr Red, Mar 7, 2001.

  1. Mr Red

    Mr Red 1/2 ton status

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    Just had to R&R radiator in my '91. Thought I'd remember this that I read somewhere. Have now had to add water after three trips/running engine.

    I recall reading somewhere, about a "procedure" for exhausting air from cooling system. Anyone have any ideas? What I've done is Warm up engine, let it cool some, then open radiator cap to let air out to reservoir then add fluid. Thanks for the help.

    [​IMG]
    <font color=red>David, '86 & '91 K5</font color=red>
    Forever missing Dale Earnhardt, who drove over more Fords than we could ever dream of
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    Hmm. I just fill it up, leave cap off, let it run longer, fill as necessary, replace cap, fill overflow tank, and call it good...

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  3. Itali83

    Itali83 1/2 ton status

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    Put your heater control on hot for a while. The same thing happend to me when I did a thermostat in the summer. Every couple days I would add a little water, but then one day I put the heater control on hot, it took a big gulp and I filled once since. Hope this does the trick.
    Ben 87 Jimmy
    "if it ain't got rust, it ain't got character"
     
  4. HarryH3

    HarryH3 1 ton status Author

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    Turning on the heater doesn't make a difference on a K5. There is no valve in the coolant line, the coolant is always flowing through the heater core. Must have just been a coincidence.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  5. Mr Red

    Mr Red 1/2 ton status

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    Done the fill "as needed" and run heater on hot. That's the way I've always done it but you can tell when there's air in the system by squeezing the upper rad. hose. If the reservoir doesn't kind of "burp" w/ each squeeze, there's still air in there. I recall reading/hearing that air in sys. is bad w/ the computer controlled engines.

    Tonight I ran him 2X. Filled up rad before 1st and squeezed upper hose and you could hear air bubbles come out. W/ each squeeze, level of fluid goes down so I added. Ran until hot. Opened up rad. & added more as in 1st run above. Went to open again and looks like I've got it but don't recall this being the method I'd read before. Thanks for the help. Keep the ideas coming!

    [​IMG]
    <font color=red>David, '86 & '91 K5</font color=red>
    Forever missing Dale Earnhardt, who drove over more Fords than we could ever dream of
     

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