Question about 2001 Volkswagen Passat

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Heater blowing cold air.

You can feel hot air coming thru the ducts until you turn the fan up,then it blows cold.

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  • Anonymous Mar 15, 2014

    heater fan extremely loud when turned on, still will blow air

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Replace thermostat its clugged,and only allows very little water to go through

Posted on Jan 03, 2009

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Hi and welcome to FixYa,

Initially, the blower/fan is both used for cold and hot. It is the vents/vanes that closes/opens where the air being blown out would be coming from, the heater or the A/C. Often, there are linkages that gets misaligned, out of position, bent, broken or simply drop off. Should this be the case, then even with the levers/controls set at hot/heater, and the heater working, the vents are drawing air from the A/C section (even if it is not working) and not from the heater core.

Good luck and Thank you for using FixYa.

Posted on Jan 03, 2009

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Check the water contol valve operation ( under hood connected to heater hoses), do you have a full load of coolant?, also air mix door under dash, is the temp of the coolant hot?.Check them all out, you'll find it

Posted on Jan 03, 2009

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1 Answer

Why is my heater blowing cold


Most likely it is the heater control valve that shifts air from blowing across your heater core to your air conditioner core.

If your fan works and your car is fairly new..meaning your heater core isn't dirty and full of craap...then it is the climate cotrol valve.
If you are lucky, it might be a thermostat that is bad and blocking hot water from entering your heater core. Bottom line, if hot water doesn't circulate thru that little heater core, you won't get heat.
You might be able to look under the hood and grab the hot water lines that go thru the firewall and feed your heater core. If they feel cold to the touch after engine has warmed up, then you aren't getting circulating water to the heater core. If they feel nice and warm, then the heater core is fine, but your climate control valve has closed off the fan that blows across the core to disperse heat into the cabin

Feb 24, 2015 | Cars & Trucks

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2002 Ford Taurus, Heater blows cold air?


What have you checked so far ?
Radiator full of coolant ? Heater hoses getting hot ?

Feb 23, 2015 | 2002 Ford Taurus

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1999 chevy silverado heater fan only blows cold air , both coolant lines in are hot


I like that you were knowledgeable to check both coolant lines tells me you are getting hot coolant through the heater core next thing to check will be the blend door on the inside of your vehicle. The blend door is a door that switches from cold air duct to heater duct depending on what you are using at the time. If it is stuck on the cold air duct you will not get any heat sometimes these doors are vacuum actuated and sometimes they are electrically actuated most the time you are able to see the movement of the motor from inside if you don't see any movement but you hear it move chances are it is the door blend I hope this helps.

Jan 10, 2013 | 1999 Chevrolet Silverado 1500

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My Buick skylark doesn't leak but it over heats..


To troubleshoot this types of problem,click the link below :---

All types of car overheating problems and troubleshooting? http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html

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heater blows through defrost?

-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

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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

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This will help.Thanks.

Dec 08, 2011 | 1995 Buick Skylark

1 Answer

Heater stopped blowing hot air this wonter


You need to check the heater core it has two hoses going to it feel of them if one is hot and the other cold heater core is stopped up replace it or flush it out if they are both hot it can be the switch or a vacuum line the vacuum line will be on the passenger side under the hood where the airconditioner hoses go in the body

Jan 21, 2010 | 1994 Chevrolet Camaro

2 Answers

Heater blows cold air. also, the temperature gage


A thermostat stuck in the open position can cause both of these problems

Nov 12, 2009 | 2002 Chevrolet S-10

1 Answer

Heater blowes cold air replaced heater controls and all vales are working the heater core gets hot on both sides so how do i fix this


It seems to me if your heater core is hot, and the fan blows cold air, then your ducting is closed off. Try and see if your duct door is opening up. You say you changed out your controls, but it sounds as though it wasn't your controls that were bad, but what they control is not opening up.
It's all well and good that the heater core is getting hot, but if the fan cannot deliver that hot air passing through it, then walah.
It has to be an air duct obstruction. Either the ducting is collapsed, the duct door is not opening, or you have some obstruction blocking the ducting. My guess, because that is all I can give you without seeing for myself, is that the linkeage or solonoid that opens the duct door is not working. Older cars had a cable, but I believe newer use a solonoid to operate the opening and closing of the door. The door is there so you don't get the heat from the core when you are using AC.
Hope this helps.

Sep 11, 2009 | Dodge Pickup Cars & Trucks

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