PRHT drains clog too
Added · Updated
What causes "PRHT drains clog too" on the Mazda Miata NC (2006-2015 US model years), and how is it fixed?
A club tech article says the PRHT has its own drains: tubes from the rear window area and drain pans behind and below the roll hoops, each with a debris grate that can block. Fix: Test each drain by pouring water and clear blocked ones with compressed air, then water.
Symptoms
Water inside the car or behind the seats on hardtop cars.
Cause
A club tech article says the PRHT has its own drains: tubes from the rear window area and drain pans behind and below the roll hoops, each with a debris grate that can block.
Fix (summary)
Test each drain by pouring water and clear blocked ones with compressed air, then water. Single club source.
Related parts
Related build entries
Other NC problems
- Recall 06V-103: driver airbag horn-assembly bolt (early 2006 cars)
- Plastic coolant expansion tank cracks and dumps coolant
- Plugged soft-top drains put water in the footwells (2006-2009 TSB)
- PRHT crunches or is hard to open (2007 TSB 09-038/07)
- PRHT windshield header and roof rattle (2007-2008 TSB 09-035/08)
- PRHT front roof panel contacts the deck when open (2007 TSB 09-035/07)
More for this car
- All Mazda Miata NC (2006-2015 US model years) fitment answers · NC common problems
- Newsletter archive: past issues with every new and corrected entry
Sources
- NC PRHT water drains: how to check and clean them — MX-5 Club of Victoria (club tech article) (editorial; read 2026-10-26; full page read)
Summaries are in our own words. Not repair instructions; consult the factory service manual.
Report a correction — spotted an error or have a better source? Email hello@chassisdex.com.