[T3] I wanted to ask on the early FI auto trans IAD

Jim Adney jadney at vwtype3.org
Thu Jul 27 15:19:13 PDT 2023

On 27 Jul 2023 at 13:02, William Jahn wrote:

>  Are these on 70 and 71 and some 72 models? Where the Temp sensor is on the
> left side and the MPS is on the right facing the rear of the car ? I can't
> remember what year Jim has.

The intake air temp sensors on the IAD are on the left on '70-2 models and 
on the right on '73s.

'69 AT IADs had no temp sensor. That sensor stuck into the engine case and 
took the place of the front AAR stud.

> All I do know is the one Tram from Samba sent me has the sensor on the
> left side and the MPS comes off the bottom left and auto trans port is next
> to the mps port but faces the right. Wasn't there some idea to run the MPS
> line up higher to prevent oil vapor from entering the MPS?

That would not be a '73 IAD. Must be a '72 or earlier. Only the '73 AT IAD 
has the TWO AT Vacuum Modulator ports. I don't know why.

I probably have a correct '73 AT IAD. Let me know if you want me to check.

'73 moved the Pressure Sensor port to the top. Oil VAPOR is still able to get 
there, but any LIQUID oil which has collected on the bottom of the IAD won't
be able to get into the Pressure Sensor hose.

Oil vapor still manages to get into the Pressure Sensors and condense 
there, but it doesn't seem to cause any problems. I used to clean those out 
regularly, but there was seldom very much, and removing it never made any 

Jim Adney, jadney at vwtype3.org
Madison, Wisconsin, USA

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