Review on ACDelco RC98 15 P.S.I. Radiator Surge Tank Cap - GM Original Equipment by Paul Rosemark
loss of coolant? This should be the first thing you replace.
My 2000 Malibu with GM 3.1 V6 was losing coolant. I've gone through all sorts of checks and tests and figured the problem might be a bad head gasket or something more expensive. I did not look at the coolant cap as I recently replaced the expansion tank and cap with a non-original unit. Looking at the aftermarket cap, I actually saw damage to the bottom o-ring. As soon as I put that on, the coolant leak stopped and the expansion tank stopped overflowing. The bottom o-ring appears to be more durable and a better fit than some aftermarket covers. For an additional $2, it's worth buying a genuine factory part.
- Standard
- I won't tell
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