1990-1993 Mazda Miata Coolant Nipple (blind cap) on Rear of Head
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1990-1993 Mazda Miata
Coolant Nipple on Rear of Head
The 1.6L engine in the NA Miata was originally designed for a front wheel drive vehicle, and has an extra, unused water outlet nipple on the back of the head that needs to be sealed off.
This nipple wears out with age, causing a coolant leak on the back right hand side of engine.