2003 Volkswagen Passat Logo
Jennifer Betancourt Posted on Jul 26, 2015
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Defrost and heat not working in 2003 passat

When i turn on my defrost it only blows cold air

2 Answers

Raylin Sutter

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  • Expert 107 Answers
  • Posted on Aug 17, 2015
Raylin Sutter
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You might have to get the AC in your car switched out. We had to do that before this summer started and we are so glad that we did. It sure was one hot summer for us! Anyways, check out a local auto repair place. Maybe they could help you! Auto Repair Auto Inspectionin Scarborough South Portland Maine

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  • Volkswagen Master 15,088 Answers
  • Posted on Jul 26, 2015
Thomas Perkins
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Hi JENNIFER,THE FIRST THING TO CHECK IS THE THERMOSTAT,IF IT IS STAYING OPEN THEN IT WON'T GET HOT,IF IT IS OKAY,THEN THE HEATER CORE MAY BE BAD.HERE'S A LINK ON CHANGING THE THERMOSTAT. Repair Guides Thermostat Removal Installation AutoZone com HERE'S A LINK ON YOUR HEATER CORE. Repair Guides Heater Core Removal Installation 1 AutoZone com ALSO YOUR VALVE THAT LETS THE COOLANT GO TO YOUR HEATER CORE COULD BE CLOGGED UP.ALSO THE VENT MIGHT NOT BE OPENING UP TO LET THE HEAT GO THRU.iS YOUR FLOOR BOARD WET,IS THEIR A MUSTY SPELL,DOES YOUR WINDOWS FOG UP,THIS IS A SIGN OF A BAD HEATER CORE.

  • 2 more comments 
  • Jennifer Betancourt
    Jennifer Betancourt Jul 26, 2015

    If my thermostat was stuck wouldnt my car overheat?

  • Jennifer Betancourt
    Jennifer Betancourt Jul 26, 2015

    My floorboard is not wet and the only time i have problems is when it rains. That is when it fogs up.

  • Thomas Perkins
    Thomas Perkins Jul 26, 2015

    When you start your engine ,it heats the coolant,when it hits the temperature that your thermostat is set at,then it opens and circulates coolant at about 180 degrees so when you use your heater,it will warm the inside of your vehicle,if the thermostat is stuck open,the coolant won't get heated and your vehicle won't over heat or the hot air won't come thru the vents,your heater core is good since no leaks.I just changed my heater core,my windows were fogging up and it was leaking,but I would take the thermostat out and see if it is open.

  • Jennifer Betancourt
    Jennifer Betancourt Jul 26, 2015

    okay i will try that first

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No heat from vents

As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html

------------

No heat on Oldsmobile Silhouette?


http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

------------

Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

-----------

Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

----------

Hot air on the driver's side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

--------------

Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

-----------

1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

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No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html
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Ford F150 Ac only blows through defrost vents?

http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

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Dodge A/C come out of defrost vents only?

http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

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http://technoanswers.blogspot.com/2012/01/ac-vacuum-line-on-dodge-cummins.html

---------

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http://technoanswers.blogspot.com/2012/01/ford-ranger-ac-blows-cold-through.html

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2005 Chrysler PT Cruiser: A/C Blows Warm?

http://whoisbyme.blogspot.in/2012/06/2005-chrysler-p8t-cruiser-ac-blows-warm.html


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These will help.

Thanks.

2helpful
3answers

Heater blows cold

To troubleshoot this types of problem,click the link below :----http://howtobyme.blogspot.in/2012/02/heater-blows-only-from-defrost.html
--------Go through the procedure to confirm the issue.------
Engine Overheats and heater blowing cold? http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
---------Heat blows cold on drivers side and hot on passenger side? http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html
-----------
This will help.Thanks.
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Air works great but no heat just blows cold air

For this types of problem,i suggest you to check this help links:----Car heater blowing warm, but not hot air?http://schematicsdiagram.blogspot.com/2011/12/car-heater-blowing-warm-but-not-hot-air.html
---------A/C, heater, defroster fan, not working?http://technoanswers.blogspot.in/2012/02/ac-heater-defroster-fan-not-working.html
--------Heater problem?http://technoanswers.blogspot.in/2012/02/heater-problem-on-isuzu-trooper.html
---------Engine Overheats and heater blowing cold?http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html
-----------Heat blows cold on drivers side and hot on passenger side?http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html----------------This will help.Thanks.
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My 2006 jeep Liberty Front Defrost blows cold air. When I turn on the heat every vent blow hot air, except the front defrost and it blows cool air...any suggestions?

Sounds like defrost door on heater box is not work You need to get under dash and check controls on the box. Good luck
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Heater blows cold

Does temp gauge on dash show normal temp? If so problem is with the controls. If sytem cycles through normal controls IE, defroster, floor,bi-level and redirects air properly check to make sure door control is functional for heater core. If door is not opening then you will never get hot air
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Fan is blowing cold air only

good day, you may have some heating core issues, anti freeze leakage, have it checked. hope this helps, have a nice day
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When i have the heater/defroster on the heater below blows cold air while the defrost blows hot. when i switch to just defrost the bottom heater stays on and blows cold air. when i have front dash and...

It sounds like you have a blend air door stuck. This is in the housing of the heater a/c blower unit under the passenger side of the dash. There is a motor on the top of the housing that could possibly be stuck or on working.
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