Question about 1994 Volkswagen Passat

1 Answer

How to change an o-ring above oil filter and above oil cooler.

I have a 91 passat, 2.0 16valve engine , weather got to
-25C and i think the oil filter was full of frozen oil. the car started great and i went in the house to let it warm up. i saw from the house window that the car was rapidly leaking oil.- it was coming from an o -ring above the filter, the filter screws into a square housing( oil cooler?),which is connected to a circular housing and rubber o-ring(the leak) with a sensor wire sticking out the top. i cant find a repair manual or even a diagram to figure out how to get the new o-ring in there. does anyone know how to get this part off? or a spot i can view a diagram of this part ? any help would be appreciated.

Posted by on

  • vdubber Dec 27, 2008

    I had exactly the same problem which is why I'm here. It is a nasty job to get this thing off as the cooling hoses are welded on with no room to work. There is a nut on the oil filter stem that holds the cooler on but coolent lines must be removed to get it off. This nut was loose on my car which is probably what started this problem.Some one please post a diagram.




1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 14 Answers

Remove the hoses from the top side of the engine first its a lot easier, then replace the seals on the cooler, its not a nice job even on a ramp

Posted on Jan 21, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

3 Answers

Oil leaks from the place oil fiter fit on motor

Perhaps but it could also be a bad oil filter seal. Might want to remove the filter to inspect both the seal and the housing.

Jan 12, 2014 | Audi A4 Cars & Trucks

1 Answer

1997 blazer leaks just above where the oil cooler line connects to the oil filter. What is the problem?

There is an O ring that is bad it goes in between the oil cooler adapter and the engine block.

Feb 04, 2012 | 1997 Chevrolet Blazer

2 Answers

Hi, i have automatic passat 1999 model and recently water happens to get into the gear box and it control board, i experiences a boom sound anytime the gear is changed, the oil has been changed by the...

If no external leak and the transmission fluid colour looks white, the problem belongs to the automatic gearbox oil cooler. The oil cooler has broke mixing the gearbox oil and coolant causing this milkshake. It's a small radiator core type oil / water heat exchanger. It is cracked inside and transmission oil is mixed with engine coolant. Because the transmission oil pressure is greater than engine coolant pressure, the transmission fluid level drops. See also the coolant colour inside recovery coolant reservoir inder bonnet! It could be like this:

The automatic gearbox oil cooler type oil / water heat exchanger (oil cooler):

In the picture above the transmission oil pan was removed for oil filter replacement.

May 05, 2011 | 1999 Volkswagen Passat

1 Answer

Where is the oil filter on Passat TDI? Is it a square aluminium block on the left side of the engine?

The square aluminium block on the left side of the engine is the oil cooler (water/oil heat exchanger). The oil filter is placed inside the aluminium cylinder block above the square aluminium block. It has a black plastic round cover with 14 edges. See picture below:


May 01, 2011 | 2002 Volkswagen Passat

1 Answer

Win i start the car and look under the hood, there is oil coming out of a box that is, on the side of the block. But above the oil filter ?? . How do i fix that, is it a gasket or what ??

That is the engine oil cooler. There is a 'O' ring between it and the oil filter mount. They harden and crack.

Ask your dealer for the large Oil Cooler 'O' Ring.

Remove oil filter. Remove exposed pipe nut holding oil cooler to housing. If nessacary, drain coolant so you can disconnect coolant hoses from cooler or catch coolant as hoses disconnected. Swing oil cooler away and remove old 'O' ring.

Place new 'O' ring with grease on oil cooler it to hold it in place and reassemble. Tighten oil filter pipe nut to around 18 ft lbs .

Refit oil filter. Refit coolant hoses and top of oil and coolant.
Run engine to check for leaks and allow to cool. Top of coolant to COLD level if required.

You will need hose clamp pliers and wrench for oil cooler pipe nut. Pliers can be obtained from most parts stores.

Jan 12, 2011 | 1996 Volkswagen Jetta

1 Answer

Oil leak near oil filter, just above the oil filter

Probably the oil cooler seal. This large o-ring is located between the oil cooler and the block adapter. After removing the oil filter, you will see a single nut on the threaded portion of the pipe that the filter screws onto. Removing this nut will allow you to remove the oil cooler. You may want to disconnect the coolant lines from the oil cooler (makes the job a little easier), but be sure to plug the lines as you remove them so you don't loose coolant. The o-ring will be on the top side of the oil cooler. A new o-ring will cost you $3 to $9, depending on where you get it. For a VW repair . . . this one is cheap and pretty easy to do. The parts diagram below may help. The seal is part #19.

Dec 11, 2010 | 1999 Volkswagen Beetle

1 Answer

Oil leak above oil filter . Ther is a adapter. on a 1995 chvey 5.7 motor

There is a rubber o-ring between the oil filter adaptor and the engine block that needs replacement.
Disconnect the two oil cooler lines from the adaptor. remove oil filter. Two torx head bolts mount the adaptor to the block. rmove these and replace o-ring. Assemble in the reverse order of removal.

Feb 21, 2010 | 1995 Chevrolet G20

2 Answers

I have a 1999 Volkswagen Passat wagon 1.8L Turbo and it has almost 100,000 miles on it, I have a few problems that I haven't been able to find answers for. 1. Sluggish acceleration -i have changed the...

Have your cam seals checked. Cam seals are a big problem on these cars and a major source of oil leaks. Another source is the oil cooler gasket but that doesn't appear to be the issue here as your leaks are well above the oil cooler. Good Luck.

Oct 08, 2009 | 1999 Volkswagen Passat

1 Answer

How to change an o-ring above oil filter and above oil cooler.

take the oil filter off,the fitting that the oil filter screws on take that out your housing will then come off the oil cooler so you can replace the o ring

Dec 31, 2008 | 1999 Volkswagen Passat

1 Answer

Honda accord 1992 I have a oil leak around the oil filter is it

is it an ex?
is it a bad leak?
it could be 2 things
1) oil pressure sending unit above the filter
2) "o" ring between the oil cooler and block on ex models only. the oil cooler is between the filter and block with 2 coolant hoses attached to it. also might be the oil filter. i replace alot of sending units and oil cooler o rings.

Dec 19, 2008 | 1992 Honda Accord

Not finding what you are looking for?
1994 Volkswagen Passat Logo

307 people viewed this question

Ask a Question

Usually answered in minutes!

Top Volkswagen Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22306 Answers


Level 3 Expert

77499 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8826 Answers

Are you a Volkswagen Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides