Question about 1991 Volkswagen Passat

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Heater problem my heater in my vw passat will blow cold air only, changed thermostat but still the same.

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Maybe your cooling system needs flushing and new anti-freeze putting in. Or I think the most obvious thing is your heater matrix which may be blocked or leaking, What temprature is your car going to?

Posted on Oct 11, 2009

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Make sure it has enough antifreeze otherwise try giving a good flush

Posted on Feb 11, 2009

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My 2001 vw passat blow air but not hot.replace the temp.sensor but nothin happen.


check it the heater control is allowing hot water through the heater core.(turning the tap on )

Dec 28, 2013 | 2001 Volkswagen Passat

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I have a 2005 VW Passat. In September I replaced the heater core, I flushed the coolant and replaced the coolant, because I wasn't getting any heat, it was just blowing cold air. I was told it wasn't the...


Are your cooling fans working?Could be your thermostat,to check put in pot of hot water at 190 degrees and see if it opens,then remove to see if closes,if it does this,then it's good,another thing is the coolant may need bleeding,air inside system or bad water pump,not circulating,bad bearing.

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1999 VW Passat heat not working


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.

Oct 25, 2012 | 1999 Volkswagen Passat

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Heater in my 2001 vw passat 2.8 GLS blows cold air. How can I fix it?


Possible air lock in cooling system or thermostat is faulty.

Dec 21, 2010 | 2001 Volkswagen Passat

1 Answer

The heater on my 2002 VW Passat is blowing cold.


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.

Mar 28, 2009 | 2002 Volkswagen Passat

1 Answer

My car over heats and only blows cold air through the heater


Sounds like your thermostat is stuck or bad. Replace thermostat.

Jan 31, 2009 | 1991 Volkswagen Passat

1 Answer

1986 VW Golf heater blows cold 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.
if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.

Jan 14, 2009 | 1986 Volkswagen Golf

2 Answers

2004 VW passat not heating


COLD AIR WHEN IDLING COULD BE...
1) Low on coolant - the most common reason for this heater problem. Make sure your coolant level is full.
If the level is low, it could be because the radiator cap is not sealing well or it could also be a cracked overflow container (hot coolant that bleeds out of the engine and drops to the street so you never see the puddle on your driveway).

2) An air-lock in the coolant system - it needs to be burped. Park your car facing-up the steepest hill you can find. Remove the radiator cap a (be careful - best to do when engine is cold) and rev engine to 2000 RPM for 60 seconds - hopefully the air will burp out the cap. Top it off with 50/50 antifreeze.

3) A disconnected or cracked vacuum line. I've heard about this one but never investigated.

Dec 08, 2008 | 2004 Volkswagen Passat

3 Answers

2001 VW Passat


Ok, have your coolind system backflushed. Your heater core could be clogged. This could have been caused in using the wrong antifreeze system or mixing the green with the vw g-12 antifreeze. This could ran you about $110 to 150 dollars at a radiator shop...stay away from the Jidffy lube or oil doctor's . This could be your cheaper alternative to solution to your problem..good luck..

Nov 19, 2008 | 2004 Volkswagen Passat

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1991 vw passat 9A 16v 2l B Charging and instrument cluster problem One day car did not start-turn key and nothing at all.(no power to inst. cluster no turning, nothing) One hour later it did turned on and cranked. and run fine. Next day repeated.Battery was dead.When jumped jumper cable melted.The alternator was shorting. Replaced battery and alternator. But alternator is not charging.Alternator tested as good.Replaced anyway, for another alternator that also tested as good just for the heck of it. Still not charging and whole instrument cluster and radio have no power from the very first replacement repair till now. Car will run just fine with out other el. problems as far the battery have charge above 6-7 v. I checked fuses in fuse/relay panel.Did not see any fuse burned. Is there fusible link on charging system or other fuse or relays to check besides the ones on the fuse/relay panel? I there relay that control this? I know that is grounded good. I know that is connected to + battery good. Alt+battery good. There is small blue wire running from alternator?????? called the alt. control wire. I think is says d+ or something on the alt.terminal next to it. It seems that something prevents the alternator to output power. I measured the alt. terminal + and ground when connected and running and all I read is the battery voltage dropping. I think the blue small wire and instrument cluster are close connection to this problem. Unless there is fuse or relay that I missed to check. other possibilities- ECU. -Wiring harness. First- where is all the fuses? and relays to check? fusible links? second -what is the blue wire ? third-instrument cluster involved? keep in mind that everything works besides inst cluster and charging when battery have charge above 6-7v. This car have disconnected and missing ABS and Security . Run grate for about a year till this happened. Rebuilded engine....Clean well maintained.. u4davidatgmaildotcom

Aug 19, 2008 | 1991 Volkswagen Passat

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