Question about 1999 Volkswagen Passat

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I need to know how to fix a leaking heater core on a 1991 VW Passat

Posted by tjava on

  • Anonymous Sep 10, 2008

    i have a leaking heater core i need to know how the remove it out of the car

    1992 vw passat



1 Answer


You have to take the whole dashboard out i had the same trouble with mine it's not too bad to do.

Posted on Oct 17, 2008


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I have a 2001 vw passat 2.8 and i have no coolant flow through the heater core hoses at all. I have already did a water pump and didnot help

I do not know exactly how the on and off switch turn work but check the cable connection from, to it main switch last. clog heater core. bad thermostat. tuff job. check hoses and make sure no air or space inside the hoses instead of coolant..

Feb 12, 2014 | 2001 Volkswagen Passat

1 Answer

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

2 Answers

Ineed instructions to replace the heater core on a 96 vw passat

Inspect/Replace If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

Dec 01, 2010 | 1996 Volkswagen Passat

3 Answers

My VW passatt heater does not work and now it is leaking out by the firewall,l assume the heator core is bad

yes, most likely the heater core. Need to replace, for now, keep your heater off :)

Mar 30, 2010 | 1999 Volkswagen Passat

3 Answers

My 2002 VW passat GLX V6 4 motion's heater is not very hot and my regular mechanic said the temperature is correct at 190, and the hoses are flaming hot, but he thinks it is the "doors" in the dash that...

my heat wasnt working all that great and then my thermostat and water pump went out.. took it to my mechanic.. not a vw dealership cause they wanted 1500 to fix it.. but my mechanic only want 600 and now my heat works fantastic

Dec 28, 2009 | 2002 Volkswagen Passat

1 Answer

Coolant leaking vw Passat 1.6 1999 heat on with fan, window fogs.

is the floor board on passenger side wet???If yes it's the heater core, which should be accessible by removing the glove box. Did u check the oil, to see if it 's milky??? some times on the vw of any kind, they spring a slow leak on the head gasket which could cause the abnormal starting in the morning. Which then, as the engine warms up causes the gasket to swell up and seal itself untill the engine cools completely off again. Eventually the gasket will completely fail and u'll have to bring it to a shop or get a repair manual to replace the head gasket.

Feb 25, 2009 | 1999 Volkswagen Passat

2 Answers

Heater problem

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

Feb 11, 2009 | 1991 Volkswagen Passat

7 Answers

Low heat from my 2001 Passat heater

There are known problems with this vehicle's heater core not getting enough coolant flowing through it to blow hot air.
1) Even if the coolant looks good, there are problems with the heater core plugging up. One solution is to use a heavy duty cleaner (CLR pipe cleaner) to back flush the heater core. To know if the heater core is plugged up, disconnect the 2 heater hoses at the heater core and somehow connect a hose to one end of the core. Try to flow water through, it doesn't have to be high pressure, and there should be a steady stream. If not, try to get the cleaner directly into the heater core and let it soak. Then back flush it and a lot of scale should be seen coming out.

2) The other problem is that since the heater core is the highest point in the cooling system air tends to get trapped in it. This should only happen if the coolant goes low or someone has opened the system to service it. There are a number of ways to bleed the system (vacuum bleed, pressure bleed). One of the hoses should have a small hole in it for bleeding air, pull that hose back just enough so the hole allows coolant to flow out of it. Then accelerate the engine and get a good flow coming out, when no more air bubbles are present, there should be good heat.

3)I've heard of bad water pumps with low flow causing issues as well as an aux. water pump not fuctioning correctly leading to poor heat output from the heater core. Someone should confirm this as I cannot get much information on the aux water pump(electronic pump by the alternator that is supposed to run after the car is shut off).

Hope this helps.

Nov 25, 2008 | 2001 Volkswagen Passat

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