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No coolant going through core - Blazer Chevrolet Cars & Trucks

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Plastic tab broke off allowing coolant to pass thru radiator tank without going thru core. Saw that happen about two weeks ago

Posted on Nov 28, 2012

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Posted on Jan 02, 2017

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I have a 1999 Kia sportage and the heat does not work but there is no leak in the core. Is there a bypass valve or something that stops the antifreeze from flowing to it or is the core just clogged up?


My PDF manual shows a coolant bypass pipe. I will try to look for it on my engine, later. If you can remove the hoses that go to and from the heater core, you could try to flow water through them. They may be hard to get at where they go to the core, but try to follow them to where they go in the engine compartment and remove them there. I also know of a situation many years ago in which the coolant lines were reversed going into the core. Once the system went empty during some repair, the core would not refill as there was trapped air, in the core, and the coolant would just flow in through the top pipe and run out the bottom, without flowing through much of the core.

Nov 21, 2011 | 1999 Kia Sportage

1 Answer

02 maxima blows no heat. Only one hose going to core is warm. Have new t-stat and new radiator. I'm having trouble locating blend door. Still don't know if that's the problem.


If only one hose going to the core is hot, then the heater core valve is bad. It's what stops or allows hot coolant into the core. Only one hose being hot means coolant is not traveling through the heater core. Have that valve checked out.

Jan 12, 2011 | 2002 Nissan Maxima

1 Answer

I have no heat on my 93 silverado. i have replaced the heater core,thermostat,and radiator. I checked the blend door while I had the heater core out and it works fine.With the heater hose that goes to the...


LOOKING AT HEATER CORE TOP HOSE COOLANT FLOW IN BACK OUT THROUGH THE BOTTOM HEATER CORE HOSE CHECK WATER PUMP BYPASS HOSE SEE IF IT GETS HOT.IF NOT COULD BE BLOCKAGE AT BYPASS HOSE FROM WATER PUMP OR WATER COULD BE FAULTY GETTING TOO WEAK PUMP COOLANT THROUGH SYSTEM.IF COOLANT GETTING HOT GOING TO HEATER CORE THE HEATER CORE AND COOLANT SYSTEM NEED FLUSHING OUT.

Dec 05, 2010 | 1993 Chevrolet Suburban

2 Answers

NO HEAT BLOWING COLD AIR


Make sure the coolant level is full. If coolant levels are ok you made need to replace the thermostat .You can disconnect the heater hoses going to the heater core and flushing water through with a garden hose at low pressure. If the vehicle has the 4.3L engine these are quite prone to heater cores plugging up. Would try flushing the heater core first.If that does not work most likely the thermostat is causing your issue. Be sure to fill coolant back up after servicing and allow air to bleed from the cooling system.

Dec 01, 2010 | 2003 GMC Sonoma Extended Cab

2 Answers

Car will only have sometimes and i have replaced


If the car is not providing heat and thermostat is good, then your problem is a faulty heater core. Sometimes when heat cores wear out, they sometimes give off an anti-freeze smell.
You can go to autozone.com and register for full free online repair manual with everything you could need for your car.

Nov 15, 2009 | 1996 Ford Explorer

3 Answers

I have a 2000 Jeep Cherokee and the heater does not heat


Check to see if the temp door is changing to heat,If that is fine,Then make sure the thermostat is good,maybe just replace it,and refill the radiator,and reservoir with coolant.The heater hoses going into the heater core need to be checked,while the engine is real hot,to make sure the heater hose going in the heater core,and out of the heater core are both to warm to hold by the naked hand.If only one of them is hot,and the other one is warm,to cold to the touch,then remove the heater hoses from the heater core,and use a water hose to flush the heater core out.Put the water hose in one side and flush the heater core out with the force of the water hose pressure.Then do the other heater core pipe the same way.Then replace the heater hoses back on the heater core,and refill the radiator.Make sure to get enough coolant back in the radiator.If there is not enough,the coolant will not flow threw the heater core and put out heat.I hope this is helpful,and you can do the work yourself.You may want to check those heater hose first thing.And change the thermostat anyway,sense you will have some coolant lose from flushing the heater core.If this helps,please let us know,thank you.

Oct 21, 2009 | 2000 Jeep Grand Cherokee

2 Answers

Heatercore does not get hot only one hose is hot


First make sure you have the radiator full of antifreeze also check overflow to make sure its at proper level . then let car warm up and feel hoses that go to firewall tword heater core and see if one of them are warm if so you have a blocked water control valve or its got a vacuum line off going to it .. Thanks Jerry holler if this is not it we will go from there.

Jan 29, 2009 | 1999 Ford Taurus

3 Answers

I have changed the theromast twice and flushed the coolant system.The heater core is not leaking.. the blower is still blowing cool air.


The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.

Jan 13, 2009 | 2003 Ford Expedition

4 Answers

No heat when engine is at low rpm or idle.


if engine temp. is good. i would rec. good flush of the heater core disconnect both heater hoses and flush core in both directions. (pressure washer works good)

Nov 21, 2008 | 2005 Nissan Altima

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