Question about 1991 GMC Sonoma

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Block heater removal 99 GMC 3500

I am replacing a block heater, but found thagt the screw has been stripped. I am wondering what the purpose of the screw is, and if I can drill it out. Is it a set screw, or does it have a blind nut? Any info would be great!!

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Has like a retainer on back that stretches across the hole to pull it in tight. Small bar like thing approx. 1/4" wide x 1" - 1-1/2" long. That screw is threaded into that retainer.When you buy new one you'll see what I mean. You may want to try a pair of pliers or vise grips on fitting for cord and try spinning it counterclockwise to see if things will loosen up at all. My main concern would be where that retainer will drop to, if it comes off.

Posted on Jan 31, 2009

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Posted on Jan 02, 2017

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talk with a service dealer and show them the photo
it is very possible that as it screws in with no wires attached that it is the place where a heater element would be fitted
freeze plugs ( welsh plugs ) are normally a hammer fit with no screw threads

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We were told by Canadian Tire that the block heater is leaking.. we are confused if we should change the block heater or block core? when we had the water pump replaced we had heat for 20 minutes once all...


You block heater is a heater that should be screwed into the engine block.
Yes, it can leak.
You might need a new one, or you might need only to replace the gasket on the old one.
I'm in Florida, and I can't quite see the gasket from here!
Whenever you remove the block heater, or even when it leaks, you will get air into your cooling system, and then the heater will not work well, if at all.
Once you get the leaking block heater fixed, you will need to "bleed" the cooling system of that air.
How you do that is to run the engine at a medium speed with the car heater turned on full blast, and watch the coolant level in the radiator.
Be sure to keep the radiator full of coolant, and the water pump should pump the air out in about 5 minutes.
Be blessed.,

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Diagram on how to replace heater core in 99 expedition


Removal & Installation 1997-2002 To Remove:
NOTE: Heater core must be vacuum leak tested before it is remove from vehicle if a heater core leak is suspected.
  1. Drain engine coolant.
  2. Remove instrument panel.
  3. For 5.4L (4V), if quipped, remove junction splash shield.
  4. For 5.4L (4V), if quipped, disconnect starter relay cable. ford-03-00-3579.gif

  5. For 5.4L (4V), if quipped, remove junction block bracket.
  6. Clamp inlet and outlet heater hoses.
  7. Disconnect heater hose from heater core by gently pressing it toward heater core.
  8. Remove A/C plenum demister adapter.
  9. Disconnect vacuum line.
  10. Remove 13 plenum chamber top screws.
  11. Remove blend door assembly from case.
  12. Remove heater core.
To Install:
NOTE: If needed, clean and lubricate coolant hoses with plain water.
ford-10-00-3098.gif

  1. Install heater core.
  2. Install blend door assembly to case.
  3. Install 13 plenum chamber top screws.
  4. Connect vacuum line.
  5. Install A/C plenum demister adapter.
  6. Connect heater hose to heater core.
  7. Release all clamps from inlet and outlet heater hoses.
  8. For 5.4L (4V), if quipped, install junction block bracket.
  9. For 5.4L (4V), if quipped, connect starter relay cable.
  10. For 5.4L (4V), if quipped, install junction splash shield.
  11. Install instrument panel.
  12. Refill engine coolant.
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Before replacing, however, check the outlet and/or beaker the outlet is on to see if it has tripped.
b582a38.jpg I too live in s/e Michigan, and it was -19 this am. No block heater can keep up with these extreme temps.
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How do i install block heater in 91 2wd 4 cyl sonoma


Hi ryan, yes my friend the best bet is to drain the coolant,as for the block heater,not sure which side for the sonoma but basically it is a frost plug with and internal element attached to it,once you unplug the cord typically there will be a small screw to remove, use a small punch or whatever will work and pop one side to roll the block heater so you can remove it,simple my fried,by the way a new block heater will come with installation instructions :) have fun and good luck ryan take care.

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