Question about 2001 Volkswagen Passat

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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

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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..

Posted on Apr 27, 2014

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Posted on Jan 02, 2017

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SOURCE: oil in water resovour vw 2002 passat

This is probably a head gasket problem and not an oil cooler problem.

The oil cooler is fairly easy to test.

Remove the cooler from the engine but do not disconnect cooling lines and then pressurize the cooling system. You can use a radiator test tool to put pressure on the cooling system and look for leaks. If it leaks, replace it.

You may also be able to bypass the oil cooler altogether if it leaks.

The head gasket is another story.

Get a 1/4" pipe to spark plug fitting and put a male air coupling fitting in it.

Then you can charge the cylinders with air from your compressor.

Make sure each cylinder that you test is at top dead center so that the valves are closed.

If air bubbles into your coolant, you found your problem.

If air leaks out your intake you have a bad intake valve

If air leaks out your exhaust you have a bad exhaust valve etc.


If you find this useful, please take the time to rate it.

Tim

Posted on Apr 15, 2009

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SOURCE: Where is the camshaft position sensor located in a 2001 VW Passat

when you are looking at the engine pull off the plastic cover on top then the front cover that covers you timing belt there is a wire harness tha goes right to it in the left upper coner two ten mil bolts and it comes off careful not to drop bolts down in belt that could be bad. it is that easy

Posted on Sep 01, 2009

  • 98 Answers

SOURCE: How to remove the heater core from a VW GolfMK3

there are alot of hidden screws holding the dash in. there are some up across the top of the dash by the windshield and defrost vents. also when you open the doors there are some in there. it is quit a difficult job I really dont recomend doing it yourself but if your not afraid to try and feel confident enough to tackle it good luck. it would be best to have an experienced mechanic do the job but it will cost over three hundred for labor. if you do it yourself go to a parts store that sells haynes repair manuals they cost about twelve dollars and are pretty helpfull.

Posted on Oct 31, 2009

Testimonial: "Thanks for the advice, I will find a manual and if gives some form of help I will do it myself. If not I will pay for it to be done. Thanks."

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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

1 Answer

My 2003 is not getting hot air i changed the heater hoses and put more antifreeze in and it still wont get hot air


One of two things: 1)Heater core may be plugged - on most vehicles you can switch the heater hoses around to reverse the flow of water to try to remove the blockage. This will be a temporary fix however because the foreign material will be in the coolant system and will eventually plug the core again. If you try this and it helps I would suggest flushing the coolant system to remove any loose material. 2)Failed water pump - Sometimes the impeller on the water pump gets corroded to the point where it will not move the coolant correctly. The solution for this is to change the pump. You can do some troubleshooting buy A)draining enough coolant from the system to drop the level below the upper of the two heater hoses B)remove the upper heater hose on the engine end and position the open end higher than the engine, allow coolant to drain to the point where it naturally stops C)Have a friend start the vehicle breifly and see if coolant flows from either the hose or the fittting it was connected to. If coolant flows from the hose, the core is not plugged. If coolant flows from the fitting, the water pump is working. If coolant doesn't flow at all, try switching the ends on the core if possible and repeat test. If the coolant still doesn't flow, you probably need a water pump.

Feb 11, 2011 | 2003 Pontiac Grand Am

1 Answer

Im working on and 05 subaru legacy 2.5 turbo and the heater is not blowing hot air. the engine is getting to normal operating temperature and the blend doors are actuating as designed. any suggestions?


One of two things: 1)Heater core may be plugged - on most vehicles you can switch the heater hoses around to reverse the flow of water to try to remove the blockage. Yhis will be a temporary fix however because the foreign material will be in the coolant system and will eventually plug the core again. If you try this and it helps I would suggest flushing the coolant system to remove any loose material. 2)Failed water pump - Sometimes the impeller on the water pump gets corroded to the point where it will not move the coolant correctly. The solution for this is to change the pump. You can do some troubleshooting buy A)draining enough coolant from the system to drop the level below the upper of the two heater hoses B)remove the upper heater hose on the engine end and position the open end higher than the engine, allow coolant to drain to the point where it naturally stops C)Have a friend start the vehicle breifly and see if coolant flows from either the hose or the fittting it was connected to. If coolant flows from the hose, the core is not plugged. If coolant flows from the fitting, the water pump is working. If coolant doesn't flow at all, try switching the ends on the core if possible and repeat test. If the coolant still doesn't flow, you probably need a water pump.

Feb 11, 2011 | 2005 Subaru Legacy

1 Answer

I have a 1998 Buick Park Avenue Ultra. I get cold air from the heater. One hose to the heater core gets hot, one stays cold. I have already back-flushed the heater core and also disconnected the...


If one hose is hot and the other is cold it is because the coolant is not circulating through the heater core. There is nothing else that can cause this. (no valves in the system, etc.)

Make sure that the heater core outlet hose (the one that is cold) is not kinked or pinched to prevent proper flow. If this is OK then replace the heater core. I have seen heater cores that look like they are passing water well enough when flushed with a hose but were too resricted to pass the low-pressure water from the water pump.

Dec 05, 2010 | Buick Park Avenue Cars & Trucks

1 Answer

I have no heat on my 93 silverado. i have replaced the heater core,thermostat,and radiator. I checked the blend door while I had the heater core out and it works fine.With the heater hose that goes to the...


LOOKING AT HEATER CORE TOP HOSE COOLANT FLOW IN BACK OUT THROUGH THE BOTTOM HEATER CORE HOSE CHECK WATER PUMP BYPASS HOSE SEE IF IT GETS HOT.IF NOT COULD BE BLOCKAGE AT BYPASS HOSE FROM WATER PUMP OR WATER COULD BE FAULTY GETTING TOO WEAK PUMP COOLANT THROUGH SYSTEM.IF COOLANT GETTING HOT GOING TO HEATER CORE THE HEATER CORE AND COOLANT SYSTEM NEED FLUSHING OUT.

Dec 05, 2010 | 1993 Chevrolet Suburban

1 Answer

My heat not workini but blow cold air where is


Has the car been changed coolant since it was bought? If it is time to change, let do a flush through a heater core. There are 2 coolant hoses going thru a fire wall. One for coolant in and one for coolant out. Heater only works if coolant is flowing through the heater core. Therefore, there are one or both following cases contributes to the problem: 1-If the valve control coolant flow gets stuck, then it always closes  so there is no heat. 2-If the valve is working, but the heater core gets clogged up, then there is no heat.

Oct 11, 2009 | 2000 Volkswagen Passat 4Motion

2 Answers

No heat in my dakota. flushed heater core and replaced therm with a reg one.


check for poor flow to heater core-change heater hoses -check for lime build up at intake connector or worn out water pump -if you only put water through core try using CLRlime cleaner in core-get two 6in pieces or heater hose hook them to core and pour it in and leave for 15 mins then wash out with water hose

Oct 04, 2009 | 1987 Dodge Dakota

1 Answer

Heater doesn't work. A/C works and air blows, but no heat. Flushed antifreeze and replaced thermostat already. Help.


There are 3 possible cases: 1- The Flap Divert air direction valve for air flowing through the heater core is not doing its job. 2- The heater core gets clogged up. 3- The valve to control amount of hot coolant flow to heater core gets stuck. Let's check if the water can flow to the heater core first, by disconnect the output hose from heater core while running the engine with heater set up at maximum level to see if coolant flowing out. Catch this coolant with a container to refill it back. This way you can eliminate # 2 and # 3. Good luck.

Sep 15, 2009 | Ford Taurus Cars & Trucks

2 Answers

2000 Vw passat,had no heat.


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.

To attempt to clean the core, you must flush the system multiple times. If it is still problematic, changing it is your only remaining option besides the water pump itself.

Jan 15, 2009 | 2000 Volkswagen Passat 4Motion

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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