I agree. My experience with flushes is if you don't know for sure its been done regularly its a gamble. If your not having heat problems your probably better off to skip the acid flush. All your likely to do is dislodge something and plug up your radiator. I had an old Ford truck that I did a flush on years ago. Almost immediately after doing it I started having heat problems. Turns out I plugged up over 50% of the radiator when I flushed the engine.

If you pull the thermostat and find lots of scale built up around it, and also around the hose connections, I'd skip the flush. Unless you don't mind possibly having to buy a new radiator.

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'84 300CD Turbo 132k (Anthracite Grey) - WVO - My daily driver - Recently named coo-coo-coupe by my daughter.
'84 300D Turbo 240k (Anthracite Grey) - Garage Queen
'83 300D Turbo 220k (Orient Red) - WVO - Wifes daily driver

I'm not a certified mechanic, but I did stay at a HolidayInn Express last night.