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How do I replace the heater core in my 1991 GMC Sonoma?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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dnewcombe1
  • 1564 Answers

SOURCE: Replacing heater core in 2000 GMC sonoma. Dash is

If the dash is removed you've saved about 9 10ths of the job endurance. Look around, what you believe to be, the perimeter of the heater box. I cannot, and no one else can, tell you exactly where the bolts and nuts that mount the heater box are. Therefore you must viually sixe the box and check outide in the engine compartment and inside under the dash for the mounting bolts.You'll want to start by removing the heater hoses. Then starting at the passenger side engine compartment look for a group of 10mm or 7/16ths nuts retaining the housing and remove them. Do the same inside. The housing is usually held together with screws or clips, it changes year to year. Keep a log or pix of the wires and cables and hoses(vacuum) that are connected to the housing for reassembly. You'll need to "roll" the box out from under the dash depending on how much of the dash has been removed. The core is easy to spot for is has two hoses sticking out, and, is encircled with clips or screws . Also make sure you remove the bracket around the two entry hoses if it has one. Thank you, Dana

Posted on Oct 04, 2009

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tripletauto
  • 1450 Answers

SOURCE: 1996 GMC Sonoma heater core

the dash has to come out

Posted on Sep 11, 2008

  • 1 Answer

SOURCE: NEED TO REMOVE DASH TO

yes you have to remove the whole dash assambly to replace the heater core..have fun i had to do mine twice.my new heater core lasted about 6 months.

Posted on Mar 30, 2009

  • 101 Answers

SOURCE: I am replacing the heater core on a 2000 gmc

the entire dash assembly must be removed from the vehicle to change the heater core

Posted on Oct 17, 2009

alicantecoli
  • 22156 Answers

SOURCE: replace heater core on a 94 sonoma

follow your basic instinct on this one ,thats how 99% of mechanics work

Posted on Oct 23, 2009

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1 Answer

1992 GMC Sonoma has no heat, replaced thermostat and water pump


make sure all air is bleed from the system then check the heater hoses by touching them they should feel the same temperature if not then the heater core is plugged and needs replacing.

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R/ Randy

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1996 GMC Sonoma heater core


the dash has to come out

Sep 11, 2008 | 1996 GMC Sonoma

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NEED TO REMOVE DASH TO REPLACE HEATER CORE ON 1995 GMC SONOMA


yes you have to remove the whole dash assambly to replace the heater core..have fun i had to do mine twice.my new heater core lasted about 6 months.

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