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1999 buick lesabre 3800,heater, notgetting hot enough. coolant flushed and thermostat replaced

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Blow out your heater core hoses with compressed air. I had the same thing happen with mine, and i blew it out, and it solved my problem. :) Hope this helps. James Booth

Posted on May 18, 2011


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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!

Feb 19, 2016 | 1995 Buick LeSabre

1 Answer

Heater not heating very good

If the coolant level is full and the water pump is circulating the coolant through the system adequately then the most like cause is the heater core has become clogged. The heater core can be flushed or replaced to fix the issue.

Feb 23, 2015 | 2000 Buick LeSabre

1 Answer

2002 Buick LeSabre Custom. Cooling System had brown chiffon looking foam in radiator. Drained and flushed cooling system with water. Disconnected both heater hoses and forced water through in both...

The brown looking chiffon could be oil in the water. However, if you are sure the system is ok then I would check the actuator door motor on the heater and make sure it is allowing the heat into the car. Seems as if you have done as much as you can.

Apr 22, 2017 | 2002 Buick LeSabre

2 Answers

Heater gets warm but not hot? 1995 dodge Dakota

Do you know how to carefully feel heater hoses to see if coolant getting to heater core is hot enough? Has thermostat been changed lately, and coolant system flushed?

Nov 06, 2010 | 1995 Dodge Dakota

2 Answers

When i first start the car a message appears that says ENGINE COOLANT LOW. CHECK SOON. When you check the coolant(AFTER IT HAS COOLED) , it shows to be exactly where it is suspose to be. 1999 bUICK...

The low coolant switch may be stuck, and you may even have to replace it. Last time I replaced one it was in the radiator. Also make sure the level is good in the radiator when cool.

Oct 22, 2010 | 1999 Buick LeSabre

1 Answer

I put stop leak in radiator and now the car blows cold air vs hot air when running the heater. why?

The stop leak have restricted the coolant flow to your heater core. You can try flushing out the Stop leak with Preston Radiator flush or replace the heater core. Once Cooling system flushed out, replace thermostat, radiator cap and repair coolant leak. Good luck and hope this helps, and Note: Common Black kitchen Pepper does great as a radiator stop leak without leaving any residue and can be cleaned out of the system with water and not coolant flush. Two table spoon is more then enough to stop a small leak. Good luck and keep me posted friend.

Jan 11, 2010 | 2000 Buick LeSabre

1 Answer

Heater takes along time to warm up and gets cold at idle or parked

Sounds like your thermostat is stuck open and not keeping the coolant in the motor long enough to get it good and warm. Try replacing the thermostat first and doing a good flush on the coolant system. Pay close attention to the heater core when you flush the system . Make sure it is on hot while you flush.

If that does not help, (and you can rally check this first) you may have a problem with the flow into the heater core. Feel the two hoses going into the firewall when the engine is hot and see if the hoses are hot going in and out. If you have a laser temp gage you can check the surface temp. One should be a little higher than the other.

Hope this helps.

Nov 22, 2009 | 2002 Buick Century

4 Answers

Heater blows cold air

first check your antifreeze level.

Oct 12, 2009 | 1999 Lincoln Continental

1 Answer

1992 mazda mx3 heater blows warm, but not hot. Coolant is full, heater hoses are hot. What is wrong?

Hot air is dependent on the coolant temperature and the heater core. There are several things that can cause your problem. The easiest to check is the coolant level in the radiator\reservoir. There must be enough coolant to flow freely between the engine and the heater core. The next is the thermostat. If the thermostat is not closing it would prevent the the coolant from reaching a high enough temperature to allow for hot air. The thermostat is not expensive or difficult to replace. The third thing is a blockage in the heater core. Flush the coolant system properly can sometimes take care of this. If it does not the only alternative is a new heater core.
Hope this helps.

Sep 12, 2009 | 1992 Mazda MX-3

2 Answers

2000 Buick Lesabre runs like ****

Sounds like a bad spark plug or spark plug wire arching out causing an engine misfire.

Nov 10, 2008 | 2000 Buick LeSabre

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