Question about 2004 Volkswagen Passat

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Heater cystem the engine of the car is hot but the air from the heater is cold.the heater blower works fine,and heater core valve thermostat is new.

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  • cc_carriker Jan 17, 2009

    2004 passat very little or heat. Blower works fine the car engine warms up fine. I removed the original anti freeze and flushed or the old anti freeze and replaced it with the green type. When I noticed the fuss in the reservoir, and the heat went down. I hope the heater core is not clogged.


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Heater Core is blown so now it's not producing Hot air just cold! Same thing happened in my 96 Jeep. You have to replace the heater core.

Posted on Jan 08, 2009

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2 Answers

Blower works but blows cold air what would cause this would it be the thermostat or heater core


If your thermostat is staying open then it won't get hot in the cab,if the heater is bad,it will leak and fog up the window,another cause could be the blend door is stuck close,or the valve is stuck close and antifreeze can;t circulate thru the heater core.When you first start your car does the thermometer on dash go up then cone down,if it is then thermostat is good.

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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

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Here's a list of possible culprits:

Priority Action Part Type Cause
1 Inspect - Antifreeze Needed - Coolant Level Low.
2 Inspect - Heater Control Valve - Leaking or Faulty Heater Control Valve.
3 Inspect - Thermostat - Thermostat Stuck Open.

First thing to check is your engine coolant level - quick and free.
Since your blower works, my nominee for the offending part would be the Heater Control Valve, which redirects hot coolant into the passenger compartment heater core. Without hot coolant, the blower will just blow cold air, since the heater core isn't getting the needed flow of hot coolant through it.
There may also be a fault in the "Temperature Valve Actuators" (there is a right hand and a left hand version of these - one for each side of the car).
The Right hand Temperature Valve Actuator is AC Delco part #15-72971.
The Left hand Temperature Valve Actuator is AC Delco part #15-72972.
Their pictures are available in the online AC Delco Parts Catalog at:
http://parts-catalog.acdelco.com/catalog/catalog_search.php
Here are your parts search parameters:
Vehicle: 1996 OLDSMOBILE AURORA V8-244ci 4.0L F/I Vin C ID# 17739
Group / Subgroup: Heating/AC / Heater Core and Htr Control Vlv

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first feel the heater core hoses see if both are hot if so then your problem is in the blend air door must be stuck on cold. is your blower motor blowing cold air if not your blower motor might be the problem. the blend air door is down by the blower motor.

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My 2001 toyota tundra heater wont blow hot air. I checked to see if the heater core is cloged it seems fine the heater control valve is operating properly, and I changed the thermastat. and yet the heater...


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Does the car run cold or is the temp. correct. Check the thermostat first. check that the radiator and res. is full. Check the hoses to and from the heater core. If one is hot and one is cold then either the shut-off valve to the heater core is defective or the heater core is plugged.

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I have changed the theromast twice and flushed the coolant system.The heater core is not leaking.. the blower is still blowing cool air.


The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

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