Howard and Audrey

The shop manual for our 2000 Accord 4 cyl shows a block coolant drain plug
under and to the left (facing toward) of the oil filter. But the only plugs
I see are the engine oil drain plug, and a 10mm allen head bolt directly
under the filter. Could it be the allen head bolt, or do some Accords not
have the block coolant drain plug?

Thanks,
Howard