1995 w124.

I noticed that the temp was going up to about 110 degree in stop and go traffic. temp was coming back down to 100 when in motion and then creeping back up whenever i stop.
i just replaced fan clutch housing, fan clutch, pulley, fan blades last week - previous fan clutch bearing seized etc.
anyway, i open the hood and notice that the aux fans are not coming on. i have my AC on full blast (Texas) - AC is cold as usual - but temp is creeping up whenever I stop. I read some previous threads about aux fans & this is what I have found so far.

I remove the temp sensor connector with key on and fans don't come on. mine is the later model one with four connector pins

I jump the AC sensor pigtails and fans come on at low speed. I checked freon and gauge shows it on green.

I checked fuses - all ok.

temporary solution - i left the AC pig tails connected to keep the aux fans on all the time since my AC is on all the time anyway. temp is staying between 85 and 95.

1) how do i test the four pin temp sensor on the thermostat housing? most threads in this forum discuss the older blue sensor which had two connector pins. So does the same test apply for the newer four pin connector - ie should the fans automatically come on as soon as i disconnect the connector?
2) how do i reach the relays - i unscrewed the cover and exposed the relays but the relays are buried under the housing just below the windscreen - i can get my hand in there but there is no room to pull relays up and out - I'm sure MB designed the car knowing that the relays had to come out at some point so there must be an easier way to get to the relays out...
3) what else should i check for....