Geo Prizm 1997 Owner's Manual page 239

Then, without shutting off the engine, follow these steps:
1.
2.
3. Check both sides of the dipstick, and read the lower
level. The fluid level must be between the
two dimples
Release the tab and pull out the dipstick and wipe it in the hot range.
with a clean rag or paper towel.
Push it back in all the way, wait three seconds and
then pull it back out again.
4. If the fluid level is in the acceptable range, push the
dipstick back in all the way.
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