NA/NBSeller listing
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View listing at 5xracing; opens in a new tabMiata · Buyer's guide
NA/NB Miata Heater Hoses, Rear Coolant O-Ring & Back-of-Head Leak Parts
NA/NB
Current seller options
WHERE TO BUY
Open an exact listing, then confirm fitment, stock, price, and shipping with the seller before ordering.
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Seller links checked . Prices and availability can change.
NA/NBSeller listing
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View listing at Mossmiata; opens in a new tabNA/NBSeller listing
Listed priceSee seller for current price
View listing at Miata Source; opens in a new tabNA/NBSeller listing
Listed priceSee seller for current price
View listing at Mike's Miata Parts; opens in a new tabChecking live eBay listing…
Current priceChecking live listing…
What you need to know
Common leak area: rear heater hose/coolant pipe area gets softened by oil leaks from CAS/valve-cover area. Buyers often misidentify the hose, pipe, or O-ring.
OEM numbers
Heater/coolant pipe O-ring E301-15-287NB heater core pipe O-ring BF67-61-A19. Back-of-head/heater hose leak page should include rear coolant housing/heater hose/CAS oil contamination warning.Supersession
Small-seal/hose identification page; no clean supersession chain needed.
Fitment
Common leak area: rear heater hose/coolant pipe area gets softened by oil leaks from CAS/valve-cover area. Buyers often misidentify the hose, pipe, or O-ring.
Aftermarket options
Checked generation-specific paths: genuine Mazda 1994-1997 NA nine-hose kit; genuine Mazda 1999-2005 NB heater-core hose pair; aftermarket 1999-2005 NB heater-hose pair. The BF67-61-A19 heater-core-pipe O-ring is a separate NB interior pipe seal and the checked seller marked it backordered. Diagnose whether the leak is hose, pipe, rear housing or O-ring before ordering.
Before you buy
Match NA versus NB and exact leak location. Two BF67-61-A19 O-rings seal the NB heater-core pipes; the checked seller was backordered. Oil from CAS/valve-cover leaks can soften nearby hoses, so repair contamination sources.
Research and fitment sources
Supersede reviewed 6 unique research sources for this guide. 4 also appear above as a seller or official action and are not repeated here; 2 additional citations follow.
Research last verified .