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No heat in my 2001 Audi A4 B5 2.8L with heated seats. Replaced thermostat, coolant temp sensor, heater core, and blend door actuator. What's left just the control head?

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  • 575 Answers

Seat heating has nothing to do with air conditioning. It is electrical. Check connections under the seats and fuses.

Posted on Feb 15, 2019

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Posted on Jan 02, 2017

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SOURCE: 2001 Audi A4 2.8 no or little heat

there is a valvve that lets the coolant thru the heater core when heat is selcted then when it is off it goes thru thur the return instead of the heater core i bet your car is running a little off if it is the vavle works of a vacuum line and the vavle has a crack in it

Posted on Dec 10, 2008

  • 9 Answers

SOURCE: NO heat in front of 2001 windstar van. Thumping

Blend air door may be stuck. I removed a pencil from a heater box before. It had fallen from the dash, down through the defrost vents and jamed the door.

Posted on Nov 13, 2009

  • 173 Answers

SOURCE: No heat in 98 jimmy. Replaced water pump,

Possibly.. the actuators which operate the doors actually have a position signal for reference, but the actual motors inside the actuators dont realize there is a limit and overshoot their limits causing the fine wires inside to rip apart rendering the actuator scrap but this happens when actuators are still plugged in to the connector while being taken off the heater door, and they can and will still move with the key in the off position if the actuator thinks it not in the proper position..thats how they work anyway.hope you had them unplugged untill the last, then this would'nt happen....hope this explaination helped

Posted on Dec 07, 2009

  • 118 Answers

SOURCE: i have a 1998 ford f-150 and no heat. i have

You just might have an air lock. Try bleeding the system from the heater hose at the firewall. Losen one hose a little, and at operating temp. open slightly to let air out. You will lose some coolant, but just refill the rad. Now, both hoses should get hot.

Posted on Jan 01, 2010

  • 23 Answers

SOURCE: 1998 ford taurus no heat,replaced

You might have to purge the coolent system cause when you change stuff like that you normally have to bleed the the colent system. So what you have to do is run the car untill your temp gets to 195 degrees the cut the car off and let the coolent drain down and then refill and geep doing that untill you have heat.

Posted on Jan 09, 2010

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No heat cold air Mercury Sable 2001 3.0


Thermostat stuck open, low coolant level, stuck blend door or bad blend door actuator, or blogged heater core. Feel both hoses to the heater core. They should both be about the same temp. If one is hot and the other is cold, you have a clogged heater core. If both are hot, then the thermostat is working and you've got a blend air door/actuator problem. Actuator failure is pretty common on these. Remove the actuator and open the door by hand. If you get heat, replace the actuator

Jan 06, 2018 | Mercury Cars & Trucks

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I have a 2001 saturn sl2. No heat. I have flushed heater core today and replaced thermostat. Heater lines are warm. No other problems or leaks. What is causing no heat? Its cold all the time.


If after running the engine for 5 min both heater hoses are hot, it could be a blend door problem where air is not flowing thru the heater core. You may need a shop manual to troubleshoot the control.

Nov 23, 2015 | Saturn Cars & Trucks

1 Answer

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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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

Heater core is pluged , no heat going to car


Flush or replace the heater core if it is plugged up and no heat going into the passenger area of the vehicle.

It could also be a bad blend door actuator if the heater core is hot and there is no heat inside the car circulating.

Jan 12, 2011 | 2004 Audi A4

2 Answers

Heater not working properly, doesn't get as warm as it should, fan is working, appears that the control that regulates the flow of air is not working properly


sound like a vacuum leak. you can check this by spraying wd40 very carefilly on the vacuum lines under the hood. the idle will change when a leak is detected. could also be a modulator valve or vacuum line under the dash. check this with a spray bottle filled with water. dont want the smell of wd40 in the cabin

Jan 02, 2010 | 2001 Ford Taurus

1 Answer

No heat Heater core is hot


If heater core is getting coolant circulating through it then you may have a temp blend door, or blend door actuator not working properly. The blend door is located in the air box under the dash, and the actuator is located on the air box. You may be able to visually check the operation while turning the temp knob, by locating the coresponding actuator on the air box and monitoring the movement. If it is moving ok and still no heat then the blend door, or lever is broken, which will require removal of the dash.

Oct 17, 2009 | 2001 Dodge Ram 2500 Truck

2 Answers

Heat does not work. coolant level ok and temp is ok


Might try checking the temp blend door operation or the temp blend door actuator. If all good there perhaps the control head itself is faulty.

Oct 08, 2009 | 2000 Jeep Grand Cherokee

1 Answer

2001 Audi A4 2.8 no or little heat


there is a valvve that lets the coolant thru the heater core when heat is selcted then when it is off it goes thru thur the return instead of the heater core i bet your car is running a little off if it is the vavle works of a vacuum line and the vavle has a crack in it

Dec 10, 2008 | 2001 Audi A4

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