Question about Volkswagen Passat

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2000vwpassat1.8litre blows cold air when driving I changed the thermostat . if you are running it in the garage it blows lots of heat. what could the problem be?

Replaced thermostat bled system when driving on highway cools right down. in shop gets good heat. both heater hoses are good and hot. what could be the problem?

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  • Volkswagen Master
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The heater core is failing or u dont have enough fluid--driving is takin the temp down--replace blower motor and ac evaporator when u change it since it a major job

Posted on Dec 05, 2014

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Posted on Jan 02, 2017

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Jan 27, 2016 | 2000 Chrysler 300M

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My front defroster does not work but the back heater works.. if the van is running it will heat up but when you start driving the gage goes back to cold it blows cold but defroster wont work at all


Change the thermostat. Follow the top radiator hose to the engine. There is to T stat. That will get your heat back. on the defroster, it doesn't blow out air? doesn't switch vents? or just not get hot? Year make and model please.

Dec 02, 2015 | Cars & Trucks

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Heater doesn't get hot on 96 chevy truck. Blows good, just cold. Replaced thermostat, flushed radiator. Any ideas?


Air Temperature Control Blend Door Failure No Heat or no AC (dependes on where door sticks)

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

Dec 06, 2012 | Cars & Trucks

1 Answer

I have a 1995 GMC Sierra 500, the heat only blows hot when the truck is idling, when you get up to say 30 mph or 35 mph it will only blow cold air. What could the problem be?


It sounds like the engines thermostat is stuck open, when you idle the engine has little air over the radiator so the heater will work, but when you are driving lots of air and the engine runs cold. I am sure you just need a new thermostat.

Jan 25, 2012 | 1995 GMC Sierra

1 Answer

The heater will not blow warm air until you start driving. The fan blows but its cold air. Once you start driving the air turns warm. Why?


There may not be enough coolant in the system. What happends is the heating core is nothing more than a small radiator inside the car. If the fluid is low the heating core is empty. But once you start driving the water pump works harder and fills it up. Another possible cause is a sticking thermostat. If its stuck open the engine cant retain water to heat it up. Thus blowing cold air. Whith the engine cold remove the radiator cap and check your coolant level. If it is full a replacement thermostat may be needed. HTH and dont forget to rate.

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1 Answer

HEAT BLOWS COLD AIR WHEN IDLING ONLY GETS HOT WHEN START DRIVING


You have still got air in the system.Remove the Feed back pipe from the header tank and wait for all the air to come out while the engine is running making sure you are toping up the header tank at the same time Dont allow header tank to run dry while doing this.Good luck

Jan 16, 2010 | 2001 Chrysler LHS

1 Answer

1999 dodge stratus heater blows intermittent hot and cold


HI its almost certainly a thermostat problem, Change the stat and refill slowly with the engine running to eliminate air locks in the system. Hope this helps

Apr 19, 2009 | 2002 Dodge Stratus

1 Answer

No heat just warm air


I think you are on top of your problem,,you dont need any one elses advice.
Complete rebuild of the cooling and heating system,, simple.

Jan 19, 2009 | 2001 Oldsmobile Alero

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1992 Jeep Wrangler heater not blowing hot air


How often has the coolant been changed? My only guess is that it hasn't and the hoses and the heater core are plugged up with goo and a flush is needed

Dec 05, 2008 | 1992 Jeep Wrangler

1 Answer

Car blowers are blowing cold air.


hi sharon
try changing the thermostat.it is probably stuck in the closed position. it is located at the end of the large hose that comes out the top side of your radiator. wont cost much for a garage to do it for you

Oct 25, 2008 | 2000 Ford Focus

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