Question about 1997 BMW 318
You don't HAVE to change it unless it fails, but it's usually done at the same time as the timing belt service since there's a fair amount of disassembly involved and the coolant gets drained anyhow. If you have any invasive work done on the engine involving the cooling system, you may as well do it to save headaches later on. But if your cooling system is working right and your heater is good, you don't necessarily need to change it. Keep in mind though at some point it will probably fail.
Posted on Dec 09, 2009
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Posted on Jan 02, 2017
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