Question about 2002 GMC Sonoma Extended Cab

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NO HEAT IN MY 02 GMC SONOMA top heater core hose is cool to the touch but the bottom one is hot..just replaced the intake gasket and stat and got all the air out

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I would suggest jacking the front of the vehicle as high as you can to get the trapped air in heater core out through the system and thats the only way I know of doing it air will rise to highest spot (radiator) when it is jacked up higher than heater core..........Providing you hooked up your heater hoses the way they were when you took apart.

Posted on Feb 10, 2012

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Posted on Jan 02, 2017

tripletauto
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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

what procedure is necessary for removal and replacement of a heater core in a 96/97 gmc jimmy

Posted on Oct 05, 2008

  • 3 Answers

SOURCE: 2000 gmc sierra heater

the quick connect can be removed it requires a special tool thatr i dont seem to have and one can be picked up from the nearest parts store for about 6.00 dollars i cut mine off with a drimmal tool

Posted on Dec 09, 2008

roniecon
  • 6826 Answers

SOURCE: Need to know if I am supposed to remove the dash

yes remove dash shold be one box to bring out

Posted on Jul 01, 2009

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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1 Answer

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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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Make sure the coolant level is full. If coolant levels are ok you made need to replace the thermostat .You can disconnect the heater hoses going to the heater core and flushing water through with a garden hose at low pressure. If the vehicle has the 4.3L engine these are quite prone to heater cores plugging up. Would try flushing the heater core first.If that does not work most likely the thermostat is causing your issue. Be sure to fill coolant back up after servicing and allow air to bleed from the cooling system.

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1 Answer

I am losing heat even though the heat gauge is almost at 210. What needs to be replaced?


You probably have a plugged heater core or radiator.Very common for these models with the dex-cool anti freeze.Check the hoses going to the heater core.They should be hot to the touch.Not warm but hot when the vehicle is at normal operating temperature.When it is cooled down and there is no pressure on the radiator cap,check the radiator and make sure the system is full.If the system is low you will not get heat.If this is the problem then check for leaks.If this has a 4.3 look for and intake gasket leaking.Hope this helps.Good luck.Let me know what you found.

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1 Answer

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Have you even considered the heater core? Have the heater core checked/replaced. As for the top hose collapsing...that is not good. Have the entire system checked out by a qualified mechanic.

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Heater doesnt work blows cold air, replaced thermostat and flushed heater hoses appears to have no flow through heater core, but lines arent plugged on a 1995 gmc sonoma. Why is the hot air not flowing...


This is what I did to solve the exact same problem.I got a pump that you can hook to a drill that has garden hose connections on it.I made 2 hoses to pump into my heater core and hook to the pump. I bought some radiator cleaner at Auto Zone and put it in a 5 gallon pail with about 2 gallons of hot water.I pumped the cleaner from the pail into the OUTLET side of the heater core.(By going in the outlet side you are back flushing the core.) I put an old cloth over the top of the bucket and let the outcoming cleaner run onto this cloth acting as a filter for the dirt coming out of the heater core and let the pump run about 10 minutes. Believe me,A LOT!!!!!!!!!!! of dirt,rust etc. came out of my heater core. The heat now works excellent! Good luck.

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1 Answer

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therostat stuck , or add anti freeze to reservoir if low

Jan 03, 2009 | 2001 GMC Sonoma Extended Cab

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