With the age of these cars, you want to use the "shotgun" approach to cooling system repairs (esp. since the cooling system is a weakpoint).
I recommend this since once you need to replace one or two things, other items will fail shortly thereafter.
For example, on my e30, for YEARS I had a slight overheating issue. Guage would go all the way up to 3/4 yet the thermostat was new, no leaks, no oil in coolant or vise versa, and no drop in level. Then one day a new mechanic suggested I desperately needed a rad since the lower section of my current one was actually drooping downwards. He said it was probably the original one from 1988. After that replacement my cars temp NEVER hit's 12:00 anymore, just a hair below (where it should be).
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