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I recently replaced my upper expansion tank hose, SAAB part number 4876637, due to a suspected pin hole leak. It fixed the leak, but the pleasant surprise is how much cooler the car has been running. I made no other cooling system changes, so the hose alone is making the difference. The temp gauge goes no higher than the 8 o'clock position, and we've had a few afternoons with the ambient temperature in the 80s. There's also much less fluctuation in the gauge reading.
Not bad for a $15 part that's an easy DIY installation for your son. At this point it could be worth a try.
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