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Replaced heater core, and now the heat works but only when accelerating or reving to 2000 rpms or more

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You have air trapped in the system. Set the heater control to HOT. With the engine cold remove the radiator cap, and make sure the radiator is full. Now start the engine with the cap off. Watch for air bubbles escaping and keep the system full at all times. This will take awhile as you must wait for the thermostat to open. Once you see no more air bubbles escaping put the cap back on, and leave the engine running. Find the bleeder valves on the upper portion of the cooling system and open these valves to allow trapped air to escape. You may have to go through this procedure again to remove all trapped air.

Posted on Nov 13, 2009

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You are probably low on coolant. Check it again. Sometimes it will vapour lock on you and youmay have to loosen one heater hose to let the air out.

Posted on Nov 13, 2009

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I have a 1996 Lexus SC400 that heater does not work unless I put in neutral and reve up the engine to over 3000 rpm. How do I fix?


Check the coolant level first. Make sure it is full. Take a look at the condition of the coolant. It should be bright red, green, or yellow depending on the type of coolant. If it is dark, rusty, or muddy than it is likely that the heater core has plugged do to the lack of maintenance of your cooling system .

The good news is the heater hoses can be removed from the heater core and the heater core can be back flushed to try and clean it out. This works 90% of the time. If heat returns than flush the cooling system to help prevent it from happening again. If heat still does not return than the heater core would need to be replaced. $$$$$

this vehicle may have a manual valve that controls the coolant flow to the heater core. Look for the heater hoses near the fire wall. The valve is usually inline with one of the hoses and will have a cable attached. If you see it make sure the cable is moving when you turn the heat select knob from full hot to full cold.

Feb 19, 2015 | 1996 Lexus SC

1 Answer

2002 mitsubishi eclipse wont accelerate pass 20mph and 2000 rpms


reset the CPU with a code reader as it may be still in limp mode from the engine over heat

Jan 19, 2014 | Mitsubishi Eclipse Cars & Trucks

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Only blows heat when accelerating


the ac core only blows cold air but You must be talking about the heater core.. In which case I would suggest that you bleed the air out of the coolant system as there is an air lock in the heater core.

Jan 07, 2014 | 2009 Ford Focus

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No heat replaced heater core thermostat


So the blend door opens? Does the fan motor blow? Are both heater hoses hot? That would indicate the coolant is circulating through the core.

Dec 12, 2013 | Ford Windstar Cars & Trucks

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My heat is not working on my 2000 S-10 Blazer


if the heater core is good, the hot -cold switch usually located in one of the heater hoses could need replaced or the cable is bad going to that valve. If it is stuck in closed position, you will get no heat

Oct 29, 2012 | 2000 Chevrolet Blazer

1 Answer

I cant get much heat in my 2000 chevy venture


check if your thermostate is working... is it having troubles getting to operating tempurature?
check your heater lines that run to the heater core and see if there is heat getting to and from the heater core if the thermostat is running properly...
if you have heat running to and from the heater core then check and make sure your heater controls in the van are switching between defrost and heat and floor properly
could be a heater box problem ....
when i had the same problem with my venture it turned out to be a plugged heater core and i replaced it

Dec 07, 2010 | 2001 Chevrolet Venture

1 Answer

Heating problems


replace the heating core but change the antifreeze first and clean the system and make sure there's no stop leak in the hoses. you will need to flush the heater core out completely several times to know for sure.

Mar 06, 2010 | 2004 Chrysler Sebring

1 Answer

No interior heat in my 2000 daewoo nubira


3 possible issues here,

the first is that your thermostat is stuck open, when this happens the air will barely be warm, luke warm at best, replacing the thermostat will fix this problem

the second, is that you have low coolant levels, when your coolant levels are way low, your heater core doesn't get the proper amount of coolant (if any) and the system blows cold air instead of heated air.

The third and final possibility, is that your heater core has clogged up (usually happens when stop leak or some type of radiator sealant is used) when this happens you can feel warm air when accelerating (test this by gently reving the vehicle and holding the rpm's when it is in park and holding your hands over the defrost vent to check for heat.

If you can tell me what symptom your vehicle is having I can help with instruction on how to fix it thanks cnc_couple@live.com


Jan 09, 2010 | 2000 Daewoo Nubira

1 Answer

Intermittent heater function


EmWiz is correct. You have to remove the coolant overflow bottle, and RAISE IT UP to eliminate the trapped air in the system. The heater core is above the height of the radiator, and air tends to get trapped in the core. Raising the overflow bottle is the only way to purge the trapped air. Keep adding coolant to the overflow bottle until the bubbles disappear, and you have good heat at idle.

Dec 16, 2008 | 2000 Toyota Avalon

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