Question about Audi A4

2 Answers

The Heater in my 2001 A4 Quatro has started blowing cold air even when on high. Could the air conditioner be running all the time?

Posted by on

  • Donald Hoglan Jan 02, 2011

    Hey Dan, the fuse to the heater is good. It is just for the blower moter. when I pull it the blower stops,also the airdonditioner doesnt blow. Still all I get is cool air from the heater and the hoses going into it are also cold. like when the air conditioner is on.

    Tell me how to remove the front bumper so I can see if the compressor ic running..Don

×

Ad

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Audi Master
  • 8,266 Answers

Hi, you mentioned your hoses are cold. Are those the evaporator hoses or heater hoses? The evaporator hoses are usually made of aluminum, whereas the heater hoses are rubber. It is normal for the evaporator lines to be cold. If the heater hoses are cold, assuming the engine is warm and your thermostat is not stuck open, you either have an air bubble blocking the flow of coolant to the heater core or the core is clogged. To release an air bubble, park on an incline, open the radiator cap, run the engine until the thermostat is open, crack open any/all bleed ports to release any trapped air, and fill the radiator to the neck. Wait until the level stops dropping and make sure bubbles don't continue to come up. If they do, you may have a blown head gasket that will keep forming these bubbles until you change the gasket.
If your heater hoses are still cold after purging air, and there are no bubbles coming up, your heater core is likely to be clogged. You can try to unclog the core by removing the hoses at the firewall and attaching a garden hose to the lower port by splicing with a hose and clamps. If pressurizing the lower port with water will not unclog the core sufficiently, it will have to be replaced. This is a major repair requireing removal of the dash panel and disconnect of the air conditioning system.

If your heater hoses are hot and only cold air comes out of your heater, the problem is with the heater blend door. Not sure if your blend door is motorized or uses a cable. The actuator is either on the bottom or top of the heater box shown below. Check to see if the door actuates when you change the temperature setting. If not, remove the actuator and check the door manually. Make repairs as necessary.
Please let me know if you have any questions, and thanks for using FixYa.

The Heater in my 2001 - jturcotte_701.gif

Posted on Jan 02, 2011

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Genius:

    An expert who has answered 1,000 questions.

  • Master
  • 1,098 Answers

Hi

I had this issue a while back, my problem was the fuse for the heater had melted, very starnge but I have since seen this fault on numerous A4's I would check that first. the Aircon would not blow constant and it still would not effect the hot air coming out. Diagram below

http://forums.vwvortex.com/showthread.php?5122087-Audi-A4-Fuse-Box-Diagram

That may not be the fault but worth looking at first, secondly the resister for the heater may have blown this can happen after a cold spell.

Hope this helps, if you need more specifics please get back to me.

Regards
Dan

Posted on Jan 01, 2011

  • Dan Doherty
    Dan Doherty Jan 02, 2011

    Hi Don

    Here are some video's on how to remove the front bumper, alternatively go to you tube and type in audi a4 bumper removalhttp://www.youtube.com/results?search_qu... a4 2001 bumper removal

×

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

The air conditioner continues to run even when the heater should. checked the servo motor and the flaps move fine but still blows cold air when the heat is on


Check your heater hoses and see if they are hot..If they are ,,the blend door is not operating correctly..Or ive seen the motor work but where the motor hooks to the blend door is broken...When you check the heater hoses make sure they are both hot...Not just one...If only one is hot,,then you have a clogged up heater core...

Oct 03, 2011 | 2001 Ford Taurus

1 Answer

Air conditioner charged won't blow cold air, heater core will not let cold air enter into the vehicle. If I close off the heater it will blow cold air. Heat blows all the time even in off postions


It sounds like you either have bad controls or stuck dampers in your vents. The stuck dampers are usually caused by plant debris getting in to the air system.

Jun 07, 2010 | 1998 Chevrolet Blazer

1 Answer

My audi a4 is blowing out cold air even when the


heater core clogged or heater valve

Jan 07, 2010 | 1998 Audi A4

1 Answer

2005 KA blowing hot air out when set to cold


start car.turn on air conditioner high cool .raise hood look to see if the compressor clutch is engaged and running.if yes your ac air door could be stuck closed or the air door vacuum actutator not receiving vacuum.a vacuum line is broken or off. or the control switch bad.that control the AC and heater mode. if compressor clutch is not engagged.check for power at compressor clutch.if yes compressor clutch coil open. or the air conditioner refrigerant R 134 is low take car to a private garage with a good reputation. they wont be expensive as the dealership.have them hook car air conditioner to a manifold gauge set to check your refrigerant low side and high side pressure.

Jun 24, 2009 | 1999 Ford Taurus

1 Answer

2001 tahoe front heater not working, rear heater blows warm air


Notorious for plugged heater cores. Also updated plastic restriction couplers mounted at heater core available from dealer. Try back flushing heater core. Run engine till its at operating temperature then carefully hold the inlet and outlet hose breifly with heater fan on high if hoses are nearly the same temp then flow is good , if not then core is plugged.

Jan 18, 2009 | 2001 Chevrolet Tahoe

3 Answers

96 audi a4 blowing cold air


yes, very possible. but first check your fluid level, thermostat.

Dec 06, 2008 | 1997 Audi A4

1 Answer

1997 audi A4 heater blowing cold air


You will have to change the heater core. 9 out of 10 times, when the heater is not heating the air, it is a bad heater core.

Nov 12, 2008 | 1998 Audi A4

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

396 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audi Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

yadayada
yadayada

Level 3 Expert

76051 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

14362 Answers

Are you an Audi Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...