Question about 2003 GMC Yukon XL

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03 yukon no heat

No heat in front or rear, low coolant notification on dash...i suspect heater core, how do i replace heater core?

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Yukon A/C, rear blows cold, front ducts a LOT warmer.

There is only one A/C system split into 2 zones. Check the blend door actuator, it may have failed in one position or something may be jamming it. Also check the control panel in the dash, My 98 yukon did the same thing, no matter what temp you selected for the front it would blow at about 70 degrees. There is a circuit board in the control panel that gets corroded and one of the circuits controls blend door operations. Have a look.

Posted on Jun 12, 2008

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timmybrown
  • 54 Answers

SOURCE: Rear heater not working

Possible blend door motor (controls amount of heat that comes out). Or heater core in back is clogged, or air bubble. If your able to locate the two heater hoses that run to the back of the vehicle and check to see if there hot next to the heater core. if both are hot (be careful not to burn yourself) then the flow is good usually. need to pull the panel off and check the blend door motor is working when you turn the rear heater control to cold to hot. let me know what you see

Posted on Apr 07, 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

  • 460 Answers

SOURCE: I replaced heater core in 1999 gmc sierra 1500 5.3

no,, the system works from a vacuum and has to be worked on in a service garage. sorry about the bad news...

Posted on Nov 12, 2009

  • 1608 Answers

SOURCE: Heater fan on 2002 Yukon does not operate in front, only rear.

The front blower motor is controlled by the blower resistor module.This is usually the problem with the front blower not working.I looked up the schecmatics and I don`t see separate fuses for the front and rear.But the fuse for the front blower is in the under hood fuse block.If this is good then The problem is probably the resistor module.It is next to the blower motor.The connector from the resistor connects to the blower motor.If you want to confirm this you can check for power and ground at the blower motor connector when you activating the blower switch on.This can be done with a test light.Make sure you have power going into the resistor module also.If you have power going in and no power at the blower motor then replace the resistor.Hope this helps.Good luck.

Posted on Dec 28, 2009

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1 Answer

We get heat in the rear but not in the front of our 2000 yukon


Sounds like a plugged up heater core. If you feel of the hoses that go into and come out of the front heater core they should both be hot. If only one is, you might get lucky and be able to have it cleaned out without taking your dash out.

Dec 20, 2016 | GMC Cars & Trucks

1 Answer

Low coolant suburban


Where is your coolant going is the biggest problem you have to fix first. You may want to look at the water pump too.

Jan 28, 2014 | Cars & Trucks

1 Answer

My 1996 GMC Yukon does not have any heat, just blows cold air what could it be


Check coolant level. if ok then see if engine comes up to temp. 190+ at thrmostat housing. If not, replace thermostat. If thermostat is ok, feeel heater hoses. If one is hot , and the other cold, then remove both and flush heater core. If both are hot, suspect blend door problem in heater box. probably need pro help for that.

Dec 18, 2010 | 1996 GMC Yukon

1 Answer

I have a 99 Yukon. When I bought it, the AC did not work. Turns out there are two AC systems. One operates the system that cools the front of the passenger compartment, the other cools the rear. It...


there are two heater cores. autozone.com has a great turorial on how to replace. You could try to blow low pressure air through the heater core to clear out any gunk.

Nov 11, 2010 | 1999 GMC Yukon

1 Answer

Front heat works, but rear blows cold air only


With your front heat working the most likely cause for the rear heat not to work is that there is an obstruction in the line that is preventing the warm coolant to get to the rear heater core or the rear heater core itself is plugged and not circulating. Another possible cause could be low coolant level where the system has enough coolant to provide the front system with enought warm coolant but not the rear system. Hope this helps

Dec 30, 2009 | 2004 Ford Expedition

1 Answer

Front heater not heating properly have added coolant also can smell coolant at times rear heater was not working but now it began to heat


It stopped heating because it was low on coolant and the hot coolant flowing through the heater core is what gives you heat. As for the smell 9 times out of 10 if you are smelling the sweet smell of anti-freeze in the vehicle it is the heater core. see if the passenger floorboard is wet or damp. If it is , the heater core has failed.

Dec 04, 2009 | 2004 Kia Sedona

3 Answers

Do you have to remove whole dashboard on 96 gmc jimmy to remove and replace heater core?or can you do everything from underneath the glove box?


  1. Remove the front dash panel by turning the lower screws in a counter-clockwise direction, then unscrewing the single bolt on the lip of the instrument cluster and pulling the panel out. Remove the rear wiper switch and the 4x4 switches, if applicable. Lowering the tilt wheel will allow the panel to be totally removed.
  2. Remove the radio, headlight switch module and glove box by turning their screws in a counter-clockwise direction.
  3. Remove the main dashboard by unbolting it at the front, between the windshield and firewall. There are six to eight bolts holding it in, and, once they are removed, the dash can be pulled away from the firewall. Be careful not to pull too much, as the wiring harness could become damaged.
  4. Drain the coolant system by turning the drain plug on the lower left corner of the radiator and allowing the fluid to fall into the drain pan. Uncapping the radiator can reduce the internal pressure.
  5. Remove the heater core hoses, on the upper left of the engine bay, by pinching their hose clamps with a pair of pliers and pulling them off. Some models will have screw-type hose clamps; turning them counter-clockwise will loosen them. Age and heat may have stuck the hoses to the core nipples, and the hoses can be cut right at these nipples if necessary. Leave enough hose to reconnect the new core.
  6. Unbolt the heater core's mounts with a socket wrench in a counter-clockwise direction. Once the bolts are free, the heater core can be maneuvered toward the windshield and slid out. Some coolant may splash out, so have a towel handy.
  7. Replace the heater core with a new one by sliding it into place and securing the mounting bolts.
  8. Reconnect the heater core's hoses, turn the radiator's drain plug clockwise to close it, then refill the coolant system with a 50/50 percent mix of coolant and water.
  9. Reconnect the dashboard to the firewall, then replace the front dash panel and fasten its instrument cluster screw and bottom bolts.
  10. Crank up the truck and add coolant until the heater core is filled and blowing hot air.
  11. Replace the radiator cap.
The Jimmy uses a coolant-heated radiator core mounted in the dashboard to provide heated air into the passenger compartment. This heater core can become clogged and leak, as it is usually the lowest point in the coolant system and debris settles into it. Replacement of the heater core will take the average of about two hours to complete. Good luck

Nov 19, 2009 | 1996 GMC Jimmy

1 Answer

No rear heat


The rear vent system has a separate heater core/blower system. heater core could be plugged up or the coolant lines going to rear heater core are plugged. could also be low coolant/faulty water pump not producing enough pressure, or air in the cooling system which will need to be bled if so.

Feb 22, 2009 | 2001 Dodge Durango

2 Answers

The rear heater does not generate heat - only cold air in vents


does front air work properly? for heat i mean?.. the blend doors are suspect as well as the heater hoses to the rear core and its heater valve.. possibily the control head is to blame or?, but i cant tell from here

Jan 14, 2009 | 2003 GMC Yukon Denali

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