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Heater Hose Hookup?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Blazer_Boy, Feb 24, 2001.

  1. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Trying to straighten out all the connection from the previous owner's installation of a crate motor. My bottom heater hose goes to the top of the water pump. Where it should go the radiator has a cut piece of hose with soem silicone shoved in it to block it off. On our '81 that hose doesnt go to the pump but the radiator. Should I take that hose off the water pump and put it back on the radiator?

    June 2001 - The Texas Sawz All masacre begins. Be afraid rust, be very afraid. [​IMG]
     
  2. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Do you still get good heat? If everything is working well i wouldn't bother changing it. Chances are he wasn't getting enough heat to the heater core- sometimes the coolant coming off that side of rad is already too cool to provide enough heat. Coming straight off the water pump solves that problem.......


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  3. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    The bottom hose always goes to the intake. That's the in side and it pushes the air out. If hooked up backwards it will have air bubles trapped in it.
    The return will work either way but I like hooking to the radiator myself. This will preheat the coolant in the radiator so you don't get a big dump of cold water into the engine when the thermostat opens. That will cause the thermostate to close and cause hot spots in the back of the block till it fully warms. It's also easier to plug the water pump. It's a standard pipe fitting that you can pick up in the plumbing section of your local home store.

    Diging it in the dirt with my K5's
    Grim-Reaper
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