Question about 2002 Volkswagen Passat

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My 2002 vw passat wagon blows hot air out of the heating/cooling vents when the climate controls are completely off. I have the electronic climate control system. Can this be remedied?

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If you don't want just start replacing parts , then give it to your mechanic and let him scan it for you , I'm sure it can be done much faster and more efficiently rather then try to fix it over the internet.

Posted on Jun 06, 2010

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check your climate control that could be the problem not opening all the way, also if not enough hot air comming out coul be the blend door some cars they used to use vacuum instead electricity to change air outlet some times these hoses get cluged theyr conected to the climate control. now try a cardboard in front of the radiator this will give you extra heat.

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Could be your thermostat... If defective, it will not allow the engine to heat up. Take the coolant cap off before you start the car when it is cooled off. start the engine and let it idle, look at the coolant. The coolant should not be flowing or moving right when you start the engine, if it is, the thermostat is bad. If you dont have enough coolant and you see it is low, this may also cause the heater to stop working. Someone may have by-passed your heater coil, check that. Sometimes when a heater coil leaks, people will by pass it so that they can continue to use the car or they cant afford to change it. It should be located on the passenger side under the dash or on the firewall inside the engine compartment on the passenger side. Another thing could be your climate control which is a fancy name for the heater controls on your dash, sometimes the switches become defective and will not operate the heater.

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1 Answer

My ac was working fine then one day it stopped and now only hot air blows out the mechanic said the ac is fine and works good but there is a vent door that switches the ac to heater and he said it was...


There is a blender that controls the air flow to go through the heater core for heat, and the evaporator for AC. It very well could be stuck.

You maybe able to try and get it to get unstuck by running the cars AC and switching from heat to AC back and forth and see if it gets unstuck. Just turn it on full blast and go from heat to cool.

If that fails, then you may need to service it. There should be a Lever Marked VENT under the dash, usually by the Brake and other pedals on the Driver's Side. Close the VENT and that will stop the Air from coming in and leave the A/C Blowing through the outlets(Vents).

I also read this online if you have an electronic climate control. "On climate control press off and heat button and let go quickly. Then press automatic. The display will start rotating eventually displaying a code 025,125 , 024 etc. Then press defrost to stop. You may hear blend door operating atb that time. It worked for my climate control."

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disconnect the battery and try again to re sync the two sides, this is a common problem on all dual climate GM cars, if you can't get them to resync then you will need to replace the climate control head..

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On the bottom of the air unit is the lever that changes temps. It likes to fall out of place.I propped mine back with a piece of half-inch copper pipe a couple of years ago.Remove glove box then panel on front side of console to access.

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This will narrow it down to either the valve or the control head inside the car,or wiring in between them. The only way to narrow it down further is if you have a scan tool that could access the climate control data. Have seen several of these valves cause this concern and have only seen one control head cause it.

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I have the same problem, but mine was because someone put stop leak in it! otherwise, check my profile, someone posted a answer that may help you.

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to reclaibrate the climate control panel just have the engine running. turn the mode to vent, the temp to cold, the blower on high, then press and hold the rear wiper wash and wiper buttons at the same time until the panel lights up then wait about 2 minutes for it to run completly when completed. turn off ignition and then restart the engine try to se if you have heat again. if it doesntwork post the codes it gives you after the calibration test.

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Had this problem after replacing water pump. Hard system to bleed. small bleeders on heater hoses and one near the front of the engine.
VW vortex has a post on cooling system bleeding. check to see if both heater hoses are hot. if so check the climate control: push econ and mode at the same time. it will give you codes. The blend door can be checked for freedom of movement.

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