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Heater not blowing very hot new thermostat fluids are fine. Should I flush complete system or replace blend door actuator?

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If the heater core supply hoses are hot after a fully warmed up engine then the blend door is most likely the problem

Posted on Dec 02, 2016

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I have a Jeep Liberty and the heater only blows like warm air. I have replaced the thermostat and flushed the heater core and still no change. What could be wrong?


Blend door may be sticking thus mixing too much cold air with the hot. Bad blend door actuator, vacuum leak or blend door seal is bad.

Feb 19, 2015 | Jeep Cars & Trucks

2 Answers

Heater doesn't get hot on 96 chevy truck. Blows good, just cold. Replaced thermostat, flushed radiator. Any ideas?


Air Temperature Control Blend Door Failure No Heat or no AC (dependes on where door sticks)

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

Dec 06, 2012 | Cars & Trucks

1 Answer

Have tried replacing thermostat , Flushed out heater core , Fluid level is fine temp running around 196 to198 f Still no heat inside car


Either the heater core is plugged up or the temperature blend door is not functioning properly. With the engine running at operating temperature, Feel the hoses that go to the heater core. Are they both hot to the touch? If one hose is noticeably cooler then the other one, then a bad heater core is indicated. If the hoses are both hot, then check the operation of the temperature blend door.
1. Remove the passenger side lower dash board trim panel.
2. Attempt to locate the blend door actuator.
On older cars, this was usually a cable operated device. Most newer cars use a vacuum operated actuator valve. Operate the temperature control while observing this device. If no movement is detected, then the actuator is bad or the temperature control itself is bad.
Make sure all the air is bled out of the system after performing cooling system service. If it is a newer vehicle, then look for coolant air bleeds on the engine near the thermostat housing. Air might become trapped inside the heater core reducing the amount of heat produced during operation. I hope this information is helpful to you and thank you for using Fixya.com.

Jun 02, 2011 | Buick Park Avenue Cars & Trucks

2 Answers

Heater will not blow warm air. I put in new front heater core, Thermostat, waterpump (reverse flow?) and heater hoses and flushed the cooling system. Temperature gauge moves between 160 and 210.


HI. MAKE SURE YOU HAVE FLOW THRU THE HEATER CORE, AND MAKE SURE THE BLEND DOORS UNDER THE DASH WORK PROPERLY. IF THE HEATER CORE GETS HOT, THEN IT HAS TO BE A BLEND DOOR,,, THANKS MOTOR62500...

Dec 21, 2010 | 1995 GMC Suburban

1 Answer

Heater is blowing cold air


Check the heater core hoses with the engine running at operating temp, If there not 200 degrees each then you need a new water pump and thermostat and system flush. if there hot then you need a new blend door actuator located on the HVAC box behind the dash on the passenger side.

Oct 07, 2010 | 1998 Ford Taurus

3 Answers

Car warms up just fine but the heater blows cold air


both hoses is hot signifies thatcoolant circulation is just fine check the blend door actuator it might be stuck.pan the heater temp controller from hot to cold do you feel any change in temp of the air from the blower?if you dont feel any change check the blend door actuator

Jan 11, 2010 | 2002 Ford Taurus

1 Answer

MY 1998 FOR TARUS HEATER WILL NOT WORK.WAS DRIVING


It is most probably the problem with blend door or blend door actuator. But just in case I would suggest to follow the entire procedure:

First you have to identify what causes the problem.
To do this you have to:
1) When engine is cold check the level of coolant. If it is low fill it up.
2) Start engine and check if engine reaches regular temperature. If your engine is not heated enough it means your thermostat does not work properly and should be replaced
3) If engine temperature is normal, then check the temperature of pipes that go to/from heater core. These pipes are located up the fire wall (easier access is from the passenger side). If pipe/pipes are cold (even engine is warm) it means you heater core is plugged and should be flushed. Keep in mind, flushing the whole cooling system is different from flushing heater core.
4) If pipe/pipes are hot/warm, turn off the fan, switch controller to the hot position, wait for 3-4 minutes and turn on the fan. Note if the cold air blows first or warm air blows first but it cools down in 5-10 seconds. If the air blows cold than it is most probably the problem with blend door or blend door actuator.
5) If air blows warm first and then cools down, then while running engine and remaining the transmission in PARKING position, press on the gas pedal until your engine reaches 3,000 RPM. Check if your heater blows warm/hot air. If it does, then your water pump does not work properly and should be replaced. If the air still cold, I would suggest flushing the heater core.

Oct 17, 2009 | 1998 Ford Taurus

2 Answers

Heater blows cold air, replaced thermostat &


try to back flush the heater core. and if that dont work check the blend door it see if it is working.

Oct 15, 2009 | 2002 Mitsubishi Galant

3 Answers

Heater


Likely it has more to do with the door that controlls the airflow. Which should be operated by vacum might check and make sure all thevacum lines are plugged in.

Does the gauge in the car show it warms up?

Feb 24, 2009 | 2001 Ford Windstar

1 Answer

2002 jeep grand cherokee heater doesn't blow hot


If ythe heater core is not bad then I would replace the thermostat, this will stop the warm coolant running up to your engine go to the heater core.

Feb 01, 2009 | 2002 Jeep Grand Cherokee

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