Hello I am new at this so perhaps you could welcome me and give me some tips on how this works. I am happy to find a site like this...... Well I do have a question perhaps someone could take a stab at. I have a 83 320i 5 speed the problem is it runs hot a lot. The temp gauge will go over the half way mark (3/4) to be exact when sitting at a red light or when its hot. Is this normal for the E21's 81-83 for those years? If not please advise me as to what it might be. I have already gone over many things such as coolant flush, new radiator,  installed new thermostat cooler Tempature (171F versus the factory 180F thought that would help it did a little). Everything else works great belts, fan, new water pump, wow the car is great no problems other then this one I am naming please advise me thanks.
Dave
More info below on the auxiliary fan not coming on.....
Okay I have done some things to narrow down the problem.  
1st let me say this with the engine running when you turn on the A/C the auxiliary fan does come on right away and stay on.  So that right there should narrow down quite a bit of things……  To me that means its not a fuse which leaves us left with 2 things.  Either a bad relay or 1 of the 3 sensors is bad.  I did pull the relay its looks BRAND NEW AND FINE.  However I could not find a fuse or label for a fuse for the auxiliary fan.


These are my questions for you if you could please help me out here with some or all answers.  Does anyone know if there is a fuse for the auxiliary fan & if there is one where it is located at?  Is there any test I can do to see if the auxiliary fan relay is bad or good?  How many fuse boxes are there and where are there locations on my 320i 83 1.8 manual?  I only saw 1 fuse box under hood I am guessing that there is others please advise me?

Thanks for any/all help as this problem has been bothering me for some time and I am sure it is quite simple to fix.  Everything works on my car its like new.  THEREFORE there must be others on this forum or other e21 owners that have had similar problems to mine.  Perhaps there it is notorious for the relay or switch to go bad to the auxiliary fan?  I also checked the connection where the auxiliary fan connects to the switch I guess which is near the front grill and headlights.

Dave
Oh I also looked at all the fuses in the fuse box and they look good none blown that I could tell.