prijedor

I replaced O ring between oil filter cooler and housing twice and it's still leaking.Has anyone had to replace their oil cooler because of oil leak?
I have white oil pressure switch right behind serpentine belt and behind oil cooler housing that is leaking and another oil pressure switch that is brown on oposite side of oil cooler housing.When looking from underneath from drivers side white switch is on left and brown on right.
My parts store has trouble with part numbers and colors of replacement switches.Does anyone know part numbers and what color new switches supposed to be?
Car in question is 1995 90 FWD AFC engine with no oil pressure gauge.
Also,there might be a leak on oil pressure relief valve and oil temperature sensor,can't really tell from serpentine belts where oil is comming from.
How common is for those two to leak.

Lago Blue

Some folks call this water/oil heat exchanger; an 'oil cooler'.

Certainly -some- of these leaks are caused by the forward mounted Oil Pressure Switch. Here is some part number help; and some questions:

a.) The P/N (and pressure range) should be stamped into the flats of the brass hex nut of the sensor. Compare yours with those shown below.

b.) Is a white sensor in the forward position on this car (1995 90 FWD AFC engine with no oil pressure gauge) an original that has been superceded by the red one; a mis-application of a white one actually meant for another car, or a red one that has faded to white?

c.) It is possible that the white sensor (the forward sensors are well known <i>through the body</i> leakers) may be your largest or <i>only</i> leak?

See this link for all P/N's and photos:

http://www.autohausaz.com/search/pro...lid=1008537@90 SPORT&year=1995&cid=20@Engine Parts, Seals %26 Gaskets&gid=4588@Oil Pressure Switch

<u>Upper photo</u> (for > 1995 Audi > 90 SPORT > Engine Parts, Seals & Gaskets > Oil Pressure Switch):
078919081A
Febi-Bilstein/OES
Oil Pressure Switch; 2.5 Bar; 1 Pin Red Insulator
Please verify appearance, connections, and pressure range of existing unit prior to ordering. 1 per car.

<u>Lower photo</u> ( for > 1995 Audi > CABRIOLET > Engine Parts, Seals & Gaskets > Oil Pressure Switch):
056919081
CRP-Continental/Meyle
Oil Pressure Switch; At Oil Filter Housing for Light; 1.8 Bar; 1 Pin with White or Black Insulator
Please verify appearance, connection and pressure range of existing unit on engine prior to ordering. Most, but not all, models used this switch. 1 per car.

<u>Bottom drawing:</u> location of subject sensor (oil pressure switch)

prijedor

I have replaced both switches on thursday and so far no leak.
Original forward switch was white that got replaced by red switch 2.3-2.7 Bar and back switch originaly brown(.4 Bar) replaced by black switch 0.3 Bar.