1997 Vauxhall Astra advice with the corect part code for the 3 pin bottom radiator fan switch

hello
ive replaced a lot of sensors and switches + thermostat with new ones also had all the electric's checked
1997 Vauxhall Astra arctic 1.6 16v automatic with air con - engine code x16xel the radiator has a 2 speed fan
ive changed the 2 radiator fan switches top and bottom switches with new ones
the 1st switch rad switch at the top is a 2 pin this works the slow speed rad' fan + the air con fan
before i changed the top one i could only see and here the slow speed fan working only ( the air con fan was not working ) the new switch fitted is a proper vauxhall gm part code rad fan switch it now works very well (i can see and here the slow speed and air con fan working as they should )
the 2cd bottom rad switch is a 3 pin this works the fast / high speed fan
but ive noticed the high/fast speed fan is not working so i had the switch taken off it was a compatible radiator fan switch - not an original vauxhall one ) the other problem is finding the correct rad switch (ive tried 2 switches ) but the same problem
ive asked and been told by vauxhall i need to use only a vauxhall switch and when i give them my vehicle details but most of the time im told because of the year of my car the correct part is hard to find they also ask me what the part code is for ths radiator temp fan switch
(this why i contacted vauxhall to ask them for the right part coe for my radaitor fan switch)
another question do you or anyone else know the correct part code
i even got a split pin and bridged the plug to checked the fan = once i did this the high/fast speed fan worked at full blast as they say
"now the new problem is when i reconnect the plug back on the bottom rad fan switch the high/fast speed fan will not work as it should
the radiator fan will only work at slow speed
help help any advice with the corect part code for the 3 pin bottom radiator fan switch
regards jim