So I'm cleaning up the wiring in my 91 Passat wagon w/AAZ conversion (not done by me). The existing fan/cooling control system was non functional. I've decided to retrofit a diesel fan/cooling control system into the vehicle.
I started by replacing the fan with a larger diesel 2 speed fan, that also gave me the correct connector to use wiring that I have extracted from a 96 Jetta AAZ. I also have a 93 Passat AAZ to pull from, which has a similar fan/cooling control system, but not exactly the same. I have wiring diagrams from 91 passat gas, 93 passat diesel, 96 Jetta AAZ and Gas as well as some fan control module diagrams.
What I really need is info on the coolant sensors. The one in the rad I have figured out. The other 2 on the head manifold is what I need the pinouts for. There is one on the top of the manifold, and one to the side. Also, if someone knows the test procedure for the sensors and/or the fan control module that would be great.
Thanks,
Ian