Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by Sir Koscoe, Feb 19, 2013.

  1. j cat

    j cat Epic Member 5+ Years 1000 Posts

    you can do it that way what matters is the LOOP must be maintained. this is so output of the water pump goes back into the pump suction input. they have the connector to do this bypass by just removing the hoses at the heater core then using the fitting connect the 2 hoses together.

    post back why its leaking corroded or cracked plastic
  2. Sir Koscoe

    Sir Koscoe Member

    is it safe to do it that way?
  3. Conlan Rose

    Conlan Rose Epic Member 5+ Years 1000 Posts

    Yup perfeclly safe the way [MENTION=39185]j cat[/MENTION] described it. This is how the heater works normally when the heat is set to max cold it just stops sending it to the heater core.
  4. Sir Koscoe

    Sir Koscoe Member

    i meant it i were to do it the way i described?
  5. Conlan Rose

    Conlan Rose Epic Member 5+ Years 1000 Posts

    It will put stress on the water pump.
  6. TRPLXL2

    TRPLXL2 Epic Member 5+ Years 1000 Posts

    That is a great price on labor for that job, I know I wouldn't do it for that lol!! Too much that could be messed up under that dash, electrical and clips being broken and so on.
  7. j cat

    j cat Epic Member 5+ Years 1000 Posts

    perhaps I did not understand you correctly. however when you do this bypass "the flow must not be stopped or restricted".

    is that clear ? do not plug up any hoses or stop any flow out of / into the water pump.

    most connect the two hoses together or put a hose on the water pump so it connects the two pump fittings together to allow the coolant flow.
  8. D4gw00d

    D4gw00d New Member

    I have replaced a heater core in a Grand Am and in a Volvo, but not in a full-sized truck/van. I will be replacing the squirrel cage fan in our 'burban as soon as the weather breaks.

    If you have this done it is a good time to consider anything else in the dash that is annoying/needs fixing.

    Any bulbs out? Crackling speakers? Rattling vents? Any hanging wires or poorly fit plastic components? Is your heater fan squealing or chirping?

    You really don't want to disassemble the dash and have a second go at this, so you may as well fix whatever annoying things are under there all at once.

    Having said that, most of what you will be taking apart or putting back together will be cosmetic or comfort stuff, so it isn't really all that complicated as long as you have a decent manual, and lay out the parts in such a way that you have no trouble finding what goes where when reassembly time comes.

    I know you plan on hiring this job out, but it really isn't complicated. You do need to be a contortionist and to be patient and organized. Oh, and to have lazer vision to figure out wher the jeebus clips end up.
  9. Sir Koscoe

    Sir Koscoe Member

    i guess i mean to say loop from water pump to water pump bypassing the core with one hose. Are the hoses different sizes?
  10. stchman

    stchman Active Member 2 Years 1000 Posts

    Why would you want normal green coolant, that stuff has to be changed every 30K miles or so. Dexcool can go up to 100K, but I've read that 75K miles is a good interval to change.

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