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Old 11-19-2012, 03:56 PM
QAfred QAfred is offline
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Location: Panhandle of Florida
 
Join Date: Aug 2008
Posts: 919
Mein Auto: 328i, 330ci, R1200C
Because you have to remove the expansion tank to get the radiator out and you would not want to re-install a 10 year old tank after installing a new radiator. They expand at a micro level every time you get the car up to running temp. They have a limited amount of cycles before they crack. Typically they blow every 70 k or so. If it is an automatic you should also change tranny thermostat...#4.
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