vacuum switch install

Discussion in 'The Garage' started by Big GMC truck, Jan 2, 2006.

  1. Big GMC truck

    Big GMC truck Registered Member

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    I'm replacing a vacuum switch that is located on my water outlet. Will coolant come out when I take out the switch? Do I have to drain the coolant? Do I have to put anything on the threads of the switch? Thanks
     
  2. HarryH3

    HarryH3 1 ton status Author

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    Coolant will come out. I first coat the threads of the new sensor with Permatex Form-a-gasket and then just thread it in quickly after removing the old one. If you do it right, you'll only lose a few ounces of coolant. :)
     
  3. JSH

    JSH Registered Member

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    If you are talking about the thermal vacuum switch on the top of the thermostat housing, should only lose a couple of drops of coolant. I used teflon tape on my threads-not sure what GM recommends but didn't seem to leak afterwards.
     

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