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At least in hot weather, the ATF cooler inside the radiator generally blows up. This puts coolant in AT and ATF in coolant lines. Coolant in AT results in blown AT in short order. ATF in coolant hoses results in blown hoses with immediate loss of coolant. This can result in a an overheated engine in a short time, with damage to head and piston rings. This is what happened to the engine in Tom's car, it overheated. I am not talking about some 960 Volvos blowing that ATF where I am, but all or nearly all of them including mine with PO. This is not like a broken radiator neck and loss of coolant with warning. If you are driving on the highway at speed in any fairly long trip and that ATF cooler breaks inside the radiator, you will know about it after you have blown AT and maybe overheated the engine. Hence, the dealer put in my car a brand new AT directly from Volvo under warranty. Of course, one can install an additional ATF cooler (to keep ATF cool), a Magnefine filter (to keep ATF clean and reduce friction) and ATF and engine oil temperature and pressure gauges to monitor closely while driving. Good luck!
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