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My 2000 gmc sierra won't give any heat,I haven't had any signs of a heater core leaking..I have seen the trap door for defrost to passenger selection operate.where do I go to next as far as wh

The truck does not overheat,does leak some coolant at rear of engine when I look on my garage floor...

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  • Cars & Trucks Master
  • 14,363 Answers

Could be your heater core,check floor board for wetness.Here's a link on how to replace if that is the problem.

Posted on Dec 02, 2012

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 2000 Saturn ls2 Coolant leaking into car on passenger side

Your heater core is in need of replacement.

Posted on Feb 10, 2009

  • 1 Answer

SOURCE: Replace Heater Core for Volvo S70 (1999)

It is your heater core. I fixed mine for $144. Ordered the new part on Ebay and followed these instructions http://www.volvospeed.com/vs_forum/index.php?showtopic=9717 It was very simple, I'm a middle age grandmother! The hardest part was cleaning up all the antifreeze. You will need a shopvac, a small one is $20 at WalMart.

Posted on Feb 12, 2009

  • 532 Answers

SOURCE: Where is the heater core hose in my 2000 ford expedition?

check closer to just underneath the firewall--it could be a smaller problem than a heater core--Ford 4.6--5.4 engines have a tube just underneath the intake manifold that the rubber hose goes bad and it will leak towards the back of the engine.Lets hope so-what i hear its very expensive to change a heater core in an Expedition.

Posted on May 01, 2009

cj2176
  • 520 Answers

SOURCE: Prizm overheats, heater core leaks, no heat

You can bypass the core or fix it that's up to you but I would change or remove the thermostat first. If it still overheats then start looking at the water pump and radiator. Hope this helps. Good luck.

Posted on Jun 09, 2009

  • 285 Answers

SOURCE: 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

Posted on Oct 21, 2009

Testimonial: "Hello; I backflushed heater core, cooling system flush. Heater floor vent temp. went from 96 degrees to 140; Thanks for your excellent advice. Robert"

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1 Answer

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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Heater only works on heat won't switch over to defroster or vents


Sounds like the blend door. The actuator motor is located on top of the box (behind the glove box) and is notorious for failing.

Oct 26, 2012 | 2004 GMC Sierra

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Plastic heater core hose connector broke. How do you replace it?


how to replace heater core connectors ona 2000 2500 gmc serria truck

Mar 27, 2012 | 2000 GMC Sierra

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2001 gmc safari temp gauge says theres is heat but it blows cold


There are several reasons why your car's heater may be blowing cold air, instead of heat. It is important to understand how the heater works in your car before you can begin to try to diagnose why it is not working. First, there is NOT an electric heater element in the heater system in automobiles, like in portable heaters used in the home. The part that transfers heat into the passenger compartment is called a heater core. A heater core can be thought of as a miniature radiator. The car engine's coolant flows through the heater core while the fan (also called a blower), blows air through the heater core fins. When air blows through the heater core fins, it is warmed, therefore warming the passenger compartment.
Start by checking the coolant. As we already said coolant is what warms the heater core. So if the coolant is low, there may not be a sufficient amount of warmth to transfer heat to the air in the passenger compartment. Since it 's cold outside, low coolant may not effect the operating temperature of the engine significantly, so you won't be alerted to a coolant problem by the temperature gage on the instrument panel. Once the coolant is full, feel the heater hoses that go through the firewall. With the engine at normal operating temperature, BOTH of the heater hoses should be hot to the touch. If only one is hot, this indicates there is is a blockage in the heater core or there is air trapped in the heater core. Using a Lisle coolant funnel is helpful in purging the air from the cooling system. If the coolant is really brown, has been neglected, or if "stop leak" has been used at some point, the heater core could be stopped up. The blockage can sometimes be unstopped by removing the heater hoses and using a garden hose with a sprayer to flush the heater core out. If neither of the hoses are hot to the touch, there could also be a malfunctioning heater control valve, if used on the model you're working on. Check for presence of a heater control valve by following the heater hoses back to the engine. Sometimes, a vacuum line could have a break causing there to be no vacuum to operate the valve. Also it should be noted that if this is your first winter with this car (and you're unfamiliar with the car's repair history), the previous owner could have by-passed the heater core because of a leak. When a heater core leaks, usually they wet the passenger side floorboard. The labor cost to change heater cores is usually expensive, so sometimes people will loop the heater hoses and by-pass a leaking heater core instead of repairing it properly.
Next check for proper airflow. After you're sure the heater core is getting hot water flow, read the following information. Doors within the heater case are either controlled by electric actuators, cables or vacuum motors. Adjust the heat control to both extremes while listening for movement of the blend door. With a cable operated heater door it's easiest to hear the door thump when it closes. If the door is not operating, find the door that controls the airflow across the heater core. If there is an electric motor that controls the door, tapping on it can sometimes make it work temporarily for testing purposes. A vacuum operated motor needs vacuum to work, so using a handheld vacuum pump for testing is usually recommended. If the vacuum motor does not hold vacuum, the diaphragm is leaking requiring replacement. To go deeper into diagnoses of the control head's function and diagnosis, specific vehicle repair manual information is needed. But hopefully the basics laid out in this article has helped to get you started on the right track.

Nov 04, 2011 | 2001 GMC Safari

1 Answer

Heater wont blow hot air and won't defrost windshield or passenger windows.


Make sure that your coolant level is up with no air trapped,but it's probably a weak water pump or clogged heater core. don-ohio

Sep 13, 2011 | 2001 Daewoo Nubira

1 Answer

I have a 93' gmc 1500 with a v-6 the truck keeps overheating with rusty water leaking into the cab on the passenger side. Iknow this is usually the heater core, but the water leaks slowly not all at...


Overheating could be several problems, usually the thermostat at fault, maybe resolved by cleaning, may need changing.

But water seeping from into the passenger compartment could be a small hole in your heater matrix.

The way I'd go about it is flush the system out and replace the coolant also add something like "Radweld" or "Kseal" to your cooling system. Then give it a good run.

This should block any pin ***** holes you may have.

Its worth bearing in mind though, that if it doesn't work, you have to start all over again and of course you'll have lost on the coolant and radweld.

Jun 12, 2011 | 1993 GMC Sierra

1 Answer

Steam coming out vents haven seen any leaks yet


Hello jgreenley32: My name is Roger and I will help you. Steam from the a/c and defrost vent generally means a leaking heater core. The steam usually has a really sweet sickening smell to it. The longer you run the engine the thicker the steam. The way to tell for sure it is the heater core would be to bypass the heater. To do this just remove the heater hoses from the heater core at the fire wall area. Not sure where they are just follow the hoses from the engine back to the firewall on the passenger side of the truck.Remove the hoses and plug them off or put a splice between them. Start the truck and warm up the engine. If the steam is gone ? Then the heater core is bad and needs replaced. Should you need further help please just ask. Please rate the answer. Thank You for using Fix Ya. Roger

Mar 29, 2011 | 2001 GMC Jimmy

1 Answer

2002 sierra v6 heater won''t get warm. fuses all good. water not leaking from core. I circulated water thru core via hoses under hood. now what?


Replace your A/C Actuator. most common problem is that the heater vents get stuck in the closed position blocking the heat from entering the vents. I just replaced mine in my truck and it works like a champ now.

Nov 14, 2010 | 2002 GMC Sierra C/K1500

2 Answers

Flushing the heater core


I removed the hoses and took a air nozzle at low pressure and blew in the return hose connection of the core. A big chunk of paste like substance shot out then pure liquid. I put the hoses back on and tested it. Now its blowing hot!!!!!!!

Apr 10, 2010 | 2000 GMC Sierra

2 Answers

2004 Envoy Smell like Anti-freeze when turn on the air


probably is a small seep in the heater core. does not have to be leaking enough to find any inside the car to have a strong smell in there just a small seep that makes the heater core wet will do it.

May 20, 2009 | 2004 GMC Envoy

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