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How can I check to see if the heater core is bad, please help

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If the heater core is bad you will most likely have a coolant leak inside the car on the passenger floor area or you will get a sweet smell along with the windshield fogging up on defrost or whisps of smoke/steam from the vents

Posted on Apr 12, 2015


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Posted on Jan 02, 2017

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SOURCE: 2000 bmw 528i overheating

The only way a heater core can cause overheating is if it's leaking and the engine is low on antifreeze. To check it for leaks it would help to use a cooling system pressure tester.

Posted on May 23, 2009

  • 95 Answers

SOURCE: bad heater core

If it does not have air conditioning you can pull the heater core out through the glove compartment. But it sounds like you do have air conditioning and the bad news this is about a 3 to 5 hour job. Remove all the screws by the windshield remove the screws are bolts below the speakers that attaches the dash to the door post if it has a console remove that. The dash and console do not actually have to be removed but pulled way out of the way. In the engine compartment disconnect the aie conditioning hoses to the heater box. You will need a special tool for this that removes the round springer or pushes it back or out of way, then pull the hose loose. There's also a bolt or two that needs to be removed in this area. Also removed the glove box, you will be able to see better there's also a bolt or two holding the heater box up. Be careful not to damage any wires or vacuum hoses. Good luck.

Posted on Jun 22, 2010

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SOURCE: 2003 nissan sentra gx 1.8

either the heater core needs a good flush or their is a tap/valve just inside the car up under the dash normally drivers side ,and the cable has come off the lever or it could have a electric solonoid to open the valve ?' depends on where it was built and for what market as some vehicles do have small variations

Posted on Dec 12, 2010

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No heat air blows just cold air

Let car cool down then check coolant level. If it is low it won't allow coolant to pass through the heater core. If it is ok it could be stuck thermostat or bad heater core. If lines coming out of heater core are hot on both hoses it is good, if only one is hot then it is a plugged heater core. You can take hoses off and use a water hose to flush out heater core from one hose then back the other way through the other hose. Hope this helps!

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1 Answer

Hot air is blowing cold in my 2001 ford escort flight

check coolant level first. possible bad thermostat, blockage, heater core is bad. check to see if a hose going into heater core is hot, if the hose is hot and the other is cold you have a blockage in heater core. if so, sometimes you can remove the hose from heater core and flush it out with a garden hose. if above fails, flush whole system.

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1 Answer

The heater blows cool air not warm air

First check and make sure that your coolant(antifreeze) level is full, the hot coolant runs through the heater core and than air is blown over the heater core heating the air for the heater. if the coolant is full you than need to check the thermostat and make sure it is functioning properly. finally if both of those are not the problem it is possible that your heater core is bad, however if the heater core is bad you will notice coolant leaking onto the passenger side floor. so if the floor is dry I would say the heater core is not the problem

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3 Answers

Why isn't my car blowing out heat

The Heater Core is out. It's located under the passenger side under the dash in the black housing.

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Changed termustate and flushed radiator and toped it off still showin lowcollant and blowin cold are out heat

If you have a low coolant light, this would be a bad sensor, either at the radiator, or the coolant reservoir. need to replace it. as for the heater, well there are a couple of things to check. first,start the car, and let it warm up. now the engine is at running temperature, now turn on the heater(trust me), and let it run for about 2 minute. feel the 2 lines going to the heater core( they are on the passenger side going to the firewall) is the one coming from the engine getting warm, or hot. If not, there is a valve that allows hot coolant to the heater core. change this valve(they do go bad, or just get stuck), this is an easy fix. If the line is getting warm or hot, the problem will be the heater core, and will need to be replaced. hope this helps and please rate this, helpful to you or not

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5 Answers

Heater blows cold air no heat

There are three thing that can go wrong here. I will give you the two simple ones first. first, check to make sure the thermostat isn't sticking or stuck. if it is, change it. two, Hot coolant going from the engine to the heater core, is controlled by a valve at the engine(these do go bad). Check the line when the engine is warmed up by turning on the heater(I know), and feel the line after about 5 minutes. The line should get hot, or very warm. The third is your heater core is clogged and needs to be replaced. hope this helps you

Jan 21, 2011 | 1985 Nissan 300ZX

4 Answers

No heat.. replaced thermostat, radiator, water pump, heater core is not blocked help

Under the dash on the passenger's side, right next to the fan (to the left of it) you'll see a plug with 4 wires (green, blue brown, and black with a pinkish tracer) unplug it and remove the 2 screws/bolts (7 mm I think.) Pull out the temp relay (not actual name but it escapes me right now). And Viola, there's your problem. If I've helped please rate my assistance and leave a testimonial. Happy Holidays!

Dec 26, 2010 | 1997 Dodge Ram

2 Answers

I smell coolant when I turn on the heater in my 2001 Silverado. The heater will not get hot.

Your heater core is clogged, leaking, and/or going bad. If it was anything else in the cooling/heating system, you would not have the antifreeze odor. The heater core is located under the glove box. I hope this helps and good luck.
Please remember to vote 7c42499.jpg if this was helpful in any way. Thanks.

Oct 31, 2009 | 2001 Chevrolet Silverado 1500

1 Answer

2000 bmw 528i overheating

The only way a heater core can cause overheating is if it's leaking and the engine is low on antifreeze. To check it for leaks it would help to use a cooling system pressure tester.

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