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What's a heating core

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Its like a small radiator installed behind the dash usually in side a was coolant running through it. it produce heat on side the car.

Posted on Dec 01, 2012


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1991 Lincoln Town Car Heat Trapped

The valve that allows hot water into heater core is stuck in the closed position. It needs to be replaced.

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there are 2 heater core **** at the back of the motor .are they hot .you have to let it run to see if they gety hot . they get hot then you have a bad or stuck blend door motor

Nov 09, 2012 | Honda Cars & Trucks

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No in car heating,blowers working fine but it wont produce heat. Its a 51 plate grand cherokee Thanks

If it won't produce heat then you have an issue with your heater core. The heater core could be bypassed, in which case no hot coolant will get to it to produce heat inside the cabin. The heater core could be stopped up with dirt/debris, in which case the heater core can't radiate heat to produce heat in the cabin. The ducting in the dash could not be allowing the hot air to flow to the vents - therefore no heat in the cabin. I'd start with the heater core and check to see if it is bypassed. This generally happens on older vehicles because the parts can be harder to find.

Nov 01, 2011 | 2001 Jeep Grand Cherokee

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I have steam coming out of my defroster & it smells like antifreeze without the defroster or heater even being on. What could this be? I am unable to see to drive because of a film that covers the...


Oct 15, 2011 | 1997 Pontiac Bonneville

1 Answer

When my trailblazer over heats. there is fluid that leaks out of a drain hose on the fire wall. why is it?

Sounds like you may have water leaking out of your heater core.

This will cause an overheat condition, which you get because your engine cooling system can't pressure up as well.

You may also notice a kind of "sweet" smell to the air that comes from the air vents that blow when A/C or heater is on.

As water leaks into the A/C & Heater core compartment trickles to the overflow drainhose on the firewall. This is usually intended for the condensation of the A/C core but a leaking heater core will drain that way too.

From what I hear, I'd see about disconnecting the heater core hoses going into the firewall and maybe use a splice to connect them to each other OR get a two 5/8 bolts and a couple clamps and plug the hoses.

This allows you to drive car without overheating and buys some time to get you another heater core (basically a "mini-radiator") Its summer, so you don't need the heater right now but keep in won't have a heater until the core gets replaced.

Hope this helps...

Aug 13, 2011 | 2002 Chevrolet TrailBlazer

2 Answers

How to remove heater core 2004 grand prix

The entire dash does not need to be removed.
Disconnect the heater inlet and outlet hoses which enter the firewall directly under the 'hard lines' for the AC'. near the center/driver side of the fire wall. Note: A cable operated clamp removal tool helps access. They sell them at Autozone in the 'OEM' tool section)
Remove the lower kick panels on both sides.
Remove the seats and console and carpet (to access and remove the duct which goes from the bottom of the heater core outlet cover to the back seat area)
Remove the outer heater core cover.
(Note: First time through the outer heater core cover is held on only by heat stakes, no screws. You need to break the head of each of these heat stakes (look like donuts) to remove the case.
Remove the inner heater core cover (also heat stakes).
Remove the heater core.
Installation is reverse of removal.
You'll need to drill the marked dimples next to each of the now broken heat stakes. Drill 5.5mm holes in cover in these areas and replace cover with screws which should be available from GM dealer.

Oct 05, 2009 | 2004 Pontiac Grand Prix

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2003 Dodge Ram Van 1500 *** NO HEAT **

Do you have enough antifeeze in your cooling system. If not fill & check again for heat. You may have a blockage. If so remove the in & out hoses to the heater core on firewall. Be careful not to damage core. Use a garden hose to flush the core one side to the other untill running clear water. put one hose on tight & clamp, put other on loose. Have someone start engine & slowly remove loose hose to let air escape. when fluid appears put hose on & tighten. Refill rad & resevoir. Heat engine up & check for heat. Also heat cable may be off under dash.

Sep 12, 2009 | Dodge Ram 1500 Cars & Trucks

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