The heater radiator uses hot engine coolant passing through the core to create heat to warm the cabin. The blower motor moves this heated air into the interior of the car. If a heater core develops a crack or leak, it is likely that moisture will condense on the inside of the windows and the smell of anti-freeze may be apparent.
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The oil cooler/heat exchanger for the automatic transmission is one of the most overlooked sections of the E90 335d cooling system. The cooler (heat exchanger) is a part of the overall cooling system and uses coolant circulated from the regular cooling system to cool the transmission oil running through this small cooling block. We recommend servicing or cleaning the heat exchanger along with any cooling system overhaul. Or if you're having transmission faults (especially for temperature) you may want to clean the transmission cooler anyway. Replacing or cleaning the heat exchanger components could lead to better shifting of the automatic as the cooler itself can become clogged. If you're experiencing harder or hesitating shifts, and the internal transmission temperature is rising without being regulated, the components in this system are the likely cause. Staying on top of the cooling needs of the transmission will help prevent a very costly transmission repair in the future.
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OEM replacement power steering cooler for your BMW! If your power steering cooler is leaking or damaged, replace it immediately to prevent power steering failure.