I saw your "bank" also has the temp and time display now. Great.
I bought my 87 300TD knowing the AC was not working. But I am in Michigan.
I had a mildew problem in my sold 90 300E with a working AC. Every time I used the AC, the smell was bad form the vents. I used these anti-bacterial spays (Lysol?) often on it. If I did not use the AC, then there was no bad smell. So there is one advantage of having no AC.
I guess I could have the AC looked on (the previous opwner told me the expensive hydraulic hose was leaking) but I think it will stay in its non-working condition.