Congrats for the A/C !!! where in Spain are you living now? Before any mechanic touches your baby call me, we are only 3 real mechanics who know how to fix the old benz´s in Spain, me in the south, another colleague in Madrid and last one in Pamplona. BTW, normally between May and September we don´t drive our old babes around in Spain, is too damm hot, so if you see any other classic car on the road 100% driver is from north of the pirinees...
Hello! A chap from Spain, and classic enthusiast too! Really pleased to meet you here.
In Spain there are at least four that know how to handle with a good old Merc. The one from Pamplona is the mechanic that looks after Mr. Villxxxxxx´s collection (Mr. V, one of the best MB collectors in our country, is friend of my father), you (I dont know you but sure you know a lot), and in Madrid -where I live- there are two: Moret and Cochera. Moret is my man for old Mercs and Regis from Cochera is a really nice person I meet from time to time.
I dissagree in what you point out about the usage of classic cars in our country during the summer, and maybe you´ll agree with me if I explain the case, always in my humild opinion:
Classics from 1950 onwards (water-cooled or oil-cooled, doesnt matter) in perfect and original condition can handle with summer temperatures, maybe you have to be gentle in the throttle or at least not be too enthusiastic, but will pass the test. Classic cars in perfect condition and with enhanced cooling systems dont bother in any case (indeed all of my cars are enhanced for a greater cooling, I promise you the needle doenst move a milimitre from its correct temperature). What you stated applys for classics in poor state, or not really healthy or not well looked after, that are the vast mayority for our country´s discredit, and thus they are kept away from the burning summer because they will all blow their head gaskets rightaway.
For example a 1972 Porsche 911 2.4S with the oil cooler radiator from a 1984-on 3.2 installed (a straight bolt-on) instead of the original serpentine tube will be enough. or a Pagode as mine is, with its viscous coupling fan removed in favor of a much more capable electric suction fan conected to a thermostat and discretly placed in the original housing will be a life guard for your engine, or any Jaguar E-type series 1 with the series 2 radiator and the two cooling fans that equip the second series will cure all hot temperatures diseases this model can suffer.
If you dont want invest to on enhancing the cooling system, just keep it original and in perfect condition and be sensible while driving it, and for sure you will have great summer motoring, as I do. I always advise friends in this direction.
The problem is not the heat itself, but what happens when you mix poor state or weak maintanance (or the first because of the second) and really the hot temperatures we can experience in our country.
As you are mechanic you will now better than me that people want to have an "as cheap as posible" classic car maintenance, more even these days of difficult economic situation in our country... and thats opposite or simply an enemy of healthy or temperatureproof classic car motoring.
Good to meet you here, once again, and kind regards.