Question about 1986 GMC C1500

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How do I replace the heater core in a 1986 GMC Sierra Grande? How much does a new heater core usually cost?

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Usually around $80.00 canadian............The core is located under the dash on the passenger side in the plastic duck work by the fire wall....Hope this helps.

Posted on Sep 04, 2010

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How and how long to replace heater core on 2004 GMC sierra

Auto Repair Estimates Know How Much Car Repair Costs AutoMD

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Heater blowing only cold air

you may have a clogged heater core or heater core bypass valve may be stuck closed. bypass valve is usually on the firewall on one of the heater core hoses. if valve seems to be operating properly. you will need to let the vehicle cool down. disconnect both heater hoses. connect garden hose to one side of heater core let water run through one side and then the other side. if the heater core is too clogged it may need to be replaced.

Jan 17, 2013 | 1993 GMC Sierra

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2000 gmc sierra 1500 blow hot air but the air is in the dash not coming out of the vents, why?

Usually a sign of a faulty blend door.
The blend doors direct air thru the heater core and out thru the vents.

Jan 16, 2013 | 2000 GMC New Sierra 1500

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Mar 27, 2012 | 2000 GMC Sierra

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Nov 15, 2010 | 1996 GMC Sierra

1 Answer

I have a 1986 GMC Sierra 1500 and my heater core is done, I am looking to find out how I can fix this on my own and were it is located?

If you look under the hood you will see the heater inlet/outlet hoses going through the firewall. The heater core is located on the opposite side of the firewall where those hoses are connected. You can fix this on your own if you have lots of patience and determination. The hard part is just getting to the core. You must remove enough of the dash to allow access to the core. Some parts may just clip on and others are held on with screws. Take photos as you go along so you can remember how to reinstall everything. This is a very labor intensive job and that is why this is an expensive repair if you have someone do it for you. The part is cheap, the labor is not. If you do it, then this is a good time to service the cooling system. Drain, flush, replace thermostat, and fill it up with a 50/50 mix of antifreeze and distilled water. Replace any hose that is suspect. Good luck.

Oct 30, 2010 | 1986 GMC C1500

2 Answers

1996 gmc sierra its running hot....and i just put a brand new

check heater core an hoses, could be plugged or core could be shot.....or fan motor seezed, or broken wire

Jan 04, 2010 | 1996 GMC Sierra

1 Answer

At idle, Heater Core Return Line is flowing only

two things--first replace your cabin air filter.second reverse flush your heater core with a garden hose and that should remove the build up of material in your heater core and restore the flow,hope this helps

Oct 21, 2009 | 2000 GMC Sierra

1 Answer

How do i replace the heater core on my 1998 gmc sierra 1500

you gotta remove the dash and the heater core box is on the passenger side behind wear a usual glovebox would be at . you will find it in a black sealed box with your wrapped heated hoses (In&out) easy fix

May 17, 2009 | 1998 GMC Sierra

1 Answer

Heater in 200 gmc sierra is not workinmg

make sure antifreeze is full. run engine 10 min. verify engine is around 195 degrees. if not, try replacing thermostat. if it is running at 195, then maybe heater core problem or heater control not functioning properly

Nov 16, 2008 | 2000 GMC New Sierra 1500

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