Question about 2005 GMC Sierra
Must remove dash and outside heater hoses and the remove heater box under dash
Posted on Sep 06, 2010
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Posted on Jan 02, 2017
From my experience I would say that you need to take apart half the dash in your truck. I replaced a heater core in my truck and it wasnt to hard....as long as you have the right tools of course
Posted on Nov 21, 2008
this is real easy -- the heater core is under the passenger side of the dash --- should be able to replace without removing the dash -- might have to remove part of the glove box
Posted on Feb 24, 2009
The heater core is located under the dash, in the center. The container holding the core looks like a black plastic box. Remove the ash tray for easier access. You may have to also remove some other covers under the dash. You must first drain the radiator then you have to disconnect the hoses. There are two hoses connected to nipples of the heater core that go thru the center of the firewall. Remove the screws that hold on the cover to the heater core. Then you should be able to get the old one out. There might be a couple of other minor steps but I'm sure you can figure them out. For re-installation just go in reverse order to put it all back together.
Posted on May 25, 2009
SOURCE: 97 gmc heater core diagram
the hoses end at the firewall to the best of my knowledge. They have to be serviced from the engine compartment. The heater is another matter. Many of the old GM Truck products could have the heater replaced without pulling the dashboard. I would go to the local parts store & buy a repair manual on that truck for about $25 then check your hoses, then check the heater core. you can always by-pass the heater core by splicing the 2 heater hoses together with a $3 plastic hose repair kit & a couple of hose clamps. as long as the hoses are long and supple enough & not short or stiff & cracking. you can actually hear old hoses crackle when you pinch them between thumb and forefinger gently. replace as needed
Posted on Oct 15, 2009
there are alot of hidden screws holding the dash in. there are some up across the top of the dash by the windshield and defrost vents. also when you open the doors there are some in there. it is quit a difficult job I really dont recomend doing it yourself but if your not afraid to try and feel confident enough to tackle it good luck. it would be best to have an experienced mechanic do the job but it will cost over three hundred for labor. if you do it yourself go to a parts store that sells haynes repair manuals they cost about twelve dollars and are pretty helpfull.
Posted on Oct 31, 2009
Testimonial: "Thanks for the advice, I will find a manual and if gives some form of help I will do it myself. If not I will pay for it to be done. Thanks."
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