You may have read elsewhere my end of production MK2 has the radiator fan motor from a MK3 and it seems original to the car.
The factory radiator's long gone together with the original thermo switch so unfortunately can't check part numbers.
The fan motor is 3 pin.
Hellas e-catalogue (and others such as Autodoc) are quite clear about what switch should be on the car, however they are 2 pin items.
The cars thermo switch connector is 3 pin (all wired, no empty slots) suggesting the 2 pin isn't correct, but then that may be because my fan motor isn't what would be expected on a MK2
There seems to be variations if aircon / towbar etc. are fitted but none of that is applicable to me.
Yet again the inter-web is full of conflicting info. plus getting specifics about the fan motor has drawn a blank so far.
Are 8v PB MK2 fan motors single or twin speed as standard for example, if single might explain the recommended 2 pin switch.
Likewise are MK3 fans twin speed hence the socket on my car?
As I understand it most Mk2 are 3 pin, only early ones are 2 pin which is the same as Mk1. I bought a Mk1 radiator surround (same as mk2) for my old 8v K-jet, it came complete with fan but I had to swap it out for the 3 pin one from my 86 car.
I think the third pin supplies the power for run-on, so if you park the car and it's really hot, the fan will continue to go even once you've taken the key out.
I could however be completely wrong and just adding to the conflicting information available on that there web.
I'll try wiring up the fan to see if it's double speed or not, and I've since had a closer look at the wiring... a run on feature would make sense from the way it's connected up.
I went through this with the 205, though the cause that time was a completely non-standard radiator and twin fan set up. which made it a head-ache to find the appropriate thermo switch with suitable cut on / off temps.
The 2 pin switches on the whole seem to be marked as kick in 95 degrees / kick off 90 degrees.
Only having one range listed suggests they are for single speed fans.
The 3 pin switches all seem to have 2 x ranges listed, suggesting this time they are for twin speed fans (or twin fans I suppose too).
The ranges for these can vary quite a bit depending on brand, some have the low speed kick off down at 84 degrees which seems quite cold?
Fan motor is definitely a two speed one, of the three pins on it one is low and another high. Third may be feed / negative depending on how it's set up plus run on?
I always understood the later fan was 2 speed that runs on with the ignition off if the car was hot.
scs