Question about 1993 Buick LeSabre

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Heater only slightly warm. radiator full of coolant, no leaks.

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Maybe it needs a new thermostat?

Posted on Jan 06, 2011

  • raymondno932 Mar 10, 2011

    had my heatercore flushed on my 1993 Lesabre and it now works fine, tons of heat.

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What to do when 2006 Chrysler Pacifica engine temp warning light comes on?


Do not continue to operate. Operating an overheated engine will cause the engine to fail.

After the engine has cooled,
Confirm that the engine has coolant.
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Start engine and confirm as engine gets warm cooling fan at radiator turns on

Confirm that the rubber engine belt is working
Put in car heater to full hot and blower on.
Confirm heat is hot from car heater.
If heater is not hot possible water pump failure or air in coolant system keeping the coolant from circulating.
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Flush clogged heater core


The coolant is green because there is anti freeze and rust inhibitor that colours the water. If there was a blockage the engine would overheat. I suspect the thermostat has jammed open.

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I have a dodge 97 dakota, my heater doesnt blow out heat after warming up and being driven, and sometimes i kind of smell antifreeze, when i use the defroster


it sounds as if you have two problems,one the heater core is plugged and two you have a heater core that is leaking.the leak is shown when you use the defroster by the smell and chances are there is a light film of antifreeze on the windsheild.and the plugged heater core is shown by no heat.check the radiator to make sure the coolant level is full and the overflow bottle is at the full level. as a low coolant level in the radiator will cause no heat.with the car warmed up(radiator coolant hot), check the heater hoses at the firewall were they enter the heater core they should be the same temperature from one hose to the other.if the coolant level is up and the hoses are the same temperature then the heater core is plugged.if the coolant temperature is the same from hose to hose but not hot to the touch the thermostat may be weak and needs replacing.either way the heater core will need to be replaced as it is leaking into the heater box assembly

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1 Answer

1991 Cadillac Fleetwood. The heater was working on passenger side but not that warm. Added antifreeze. Seems to be leaking it. Keep adding. gone thru 2 gallons. How do i get heat.


If you've added two gallons of antifreeze, you need to find out where it's going. Make sure the antifreeze you are adding is diluted with water in a 50/50 solution. Pure antifreeze has little freeze protection and boils quickly. If there is no visible leak, check your oil for coolant contamination. Fill the radiator and leave the radiator cap off. Put the heater controls on hottest setting, but do not turn the heater on. Start the engine and watch the coolant. If the coolant level drops, add more to full. If the coolant is flowing thru the radiator when you first start the engine, the thermostat is stuck open and needs to be replaced. If the water is not flowing, then keep an eye on it and wait for the thermostat to open. Add antifreeze to keep the radiator full. Look for air bubbles or lots of foaming in the coolant. That would indicate a blown head gasket and the reason you are losing antifreeze. If there's no bubbles, and the coolant level stays full, put the radiator cap back on and see if the heater is working better.

Jan 11, 2011 | 1991 Cadillac Fleetwood

1 Answer

Heater blows only slightly wam air. radiator full of coolant, no leaks. any thoughts?


heater core might be clogged. do reverse flush of cooling system

Jan 03, 2011 | 1993 Buick LeSabre

1 Answer

Heater does not warm up. it blows out cold air


I would inspect the car for coolant leaks. If there are any they need to be repaired. Check coolan level in radiator, if full than follow this procedure. Change radiator thermostat. Drain old coolant. Remove heater core hose. Take a garden hose and run water through the heater core for 3-4 minutes or until clear. Retighten Hose. Fill radiator with premix coolant. Star car and let run with defroster on and heat on full blast. Let run for 20-30 minutes and wait till radiator fan to come on. Add coolant as the level drops in the radiator.Also open coolant bleeder screws to purge out air.

Oct 05, 2010 | 2004 Chevrolet Impala

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There is a light in the dashboard that says "check" with the shape of a little water tap. I don't know what it means.


With the engine cool, Check coolant level, or may be overheating. If coolant is low or severely low, fill it, keep cap off and start engine, allow it to run and continue to add antifreeze until level of coolant stops going down and replace cap. Fill the expansion (overfill) tank to the full cold level. Allow engine to reach operating temperature while observing the engine, radiator, and hoses for leak and look under car for drips. Also check for wet carpet inside at the front, usually on the passenger side (not sure exactly where heater core is in your Kia), so also check the drivers side. This will indicate a defective heater core, if the leak is bad. If the leak is only minor in a heater core you will notice a sweet smell inside and/or windows will steam up when you run the defrost. Also, if coolant is low check radiator cap, If you don't have to push down with slight-medium force to turn and remove it, it may be leaking there.
Hope this helps.

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2 Answers

Air, no heat '98 Astro. No leaks, engine


It sounds to me that you may have 2 problems. 1). Air Lock in the Heater Core. 2). Inactive Heat Damper in the Plenum.

But since you state that the Heater Hoses do not get warm that is indicative of an Air Lock in the Heater Core. This is a relatively simple fix. It is best performed COLD but requires a method of pressurizing the Cooling System. All reputable Auto Parts stores Sell and/or Rent Pumps that temporarily replace the Radiator Pressure Cap for Leak tests and curing Air Lock. The Collant Level must be filled FULL then pressurized and then loosening the Highest Heater Hose at the Firewall so that Air and a Small Amount of Coolant escapes. Once all the Air has escaped tighten the Heater Hose Clamp, remove the Pressure Pump, Restore the Collant Level to FULL, re-install the Pressure Cap and Start the Engine. As it Warms up you should be able to feel coolant running through the Heater Hoses and they should become warm.

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Heater problems


If you smell coolant , there is a leak. I'm leaning towards a leak in the heater core if no fluid is visable and you smell it.
Pull the blower motor off and look inside to see if it is wet.
Have you had any issues with the radiator in the recent past? Maybe tried to correct it with stop-leak and didn't open the heater to full on hot? (maybe clogged the heater core up?)

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