GM Genuine Parts 13227300 is presented as a direct-fit radiator/expansion cap, made from reinforced polypropylene with an EPDM gasket, UV-stable finish, and a neck diameter of about 45 mm, tolerating -40°C to 85°C. It seals to factory specs to limit leaks and contamination, fits OEM neck profiles, and resists heat and sunlight; installation is straightforward, longevity looks good — what trade-offs remain?
Key Takeaways
- Direct-fit replacement matching OEM specs for GM vehicles, offering reliable sealing and fit.
- Constructed from reinforced polypropylene with EPDM gasket, improving durability and leak resistance.
- Designed for OE necks (~45 mm) with ~48 mm cap diameter and standard thread pitch for secure engagement.
- UV-stable finish and temperature tolerance (-40°C to 85°C) support multi-year service under normal conditions.
- Verify neck diameter and VIN compatibility before purchase to ensure proper fit and sealing.
Product Overview and Key Specifications
Overview: the GM Genuine Parts 13227300 windshield washer fluid reservoir cap is a direct-fit replacement designed for GM vehicles, engineered to meet original equipment specifications.
This cap, offered by GM Genuine Parts and backed by General Motors, uses updated materials and OEM-grade molding.
Key specs: diameter ~48 mm, thread pitch and seal matched to factory reservoir, temperature tolerance to typical under-hood ranges, and resistant plastics.
Questions answered: Will it fit my GM? Check part number against vehicle year/model.
How durable is it? Manufactured to GM validation standards.
Practical note: replace when cracks, warping, or seal failure appear.
Fit, Performance, and Durability Assessment
When evaluating fit, performance, and durability for the GM Genuine Parts 13227300 windshield washer reservoir cap, consider how precise dimensions, material choices, and seal integrity combine to meet real-world demands.
The cap fits OE-spec necks with a nominal diameter of ~45 mm and standard thread pitch, ensuring secure engagement, minimal wobble, and correct venting.
Fits OE-spec necks with ~45 mm nominal diameter and standard thread pitch for secure engagement, minimal wobble, and proper venting
How well does it perform? It resists cracking at temperatures from -40°C to 85°C, limits evaporation, and prevents contamination.
Durability assessment: reinforced polypropylene body, EPDM gasket, UV-stable finish, expected multi-year service under normal use.
Practical note: confirm matching neck diameter before purchase.
Why Choose GM Genuine Parts for Replacement Caps
Because reliable sealing and correct fit are essential for reservoir performance, choosing GM Genuine Parts 13227300 offers a direct OEM replacement that matches original specifications for many Chevrolet, Buick, GMC, and Cadillac models.
The cap is engineered to GM tolerances, using updated materials and validated by GM engineers.
Why pick it? OEM fit, factory sealing, and consistent thread pitch reduce leaks.
What to check: diameter (approximately 45 mm), sealing lip design, and material hardness.
Practical notes: inspect mating neck for wear, verify part number against VIN, and prefer GM-backed supply chains for traceability and warranty coverage.
Frequently Asked Questions
Is This Cap Compatible With Non-Gm Vehicles?
No; compatibility is unlikely. The cap is engineered for GM OE specifications and validated for Chevrolet, Buick, GMC, or Cadillac reservoirs. Fitment with non‑GM vehicles would require verifying dimensions and sealing features before use.
Does It Include a Warranty or Return Policy?
Yes. The cap is backed by General Motors’ assurance; warranty and return specifics depend on the retailer and purchase channel. The buyer should verify terms with the seller or authorized GM Genuine Parts distributor before purchase.
Can the Cap Be Painted or Customized?
Certainly: Yes. Like a blank canvas, the cap can be painted or customized, though OEM finish may be affected; GM advises using compatible paints and proper surface prep to maintain fit, seal, and corrosion resistance.
Is Installation Hardware or Adhesive Required?
No installation hardware or adhesive is required. The cap is designed for direct replacement, snapping or threading into the existing reservoir opening; GM engineers validate fitment to OE standards, ensuring secure, tool-free installation and reliable sealing.
Where Is This Part Manufactured?
Manufactured in locations selected by General Motors, production origins reflect GM’s global manufacturing network. The cap’s provenance symbolizes engineering roots and corporate assurance, with GM’s oversight ensuring consistent quality regardless of specific plant location.
Conclusion
The GM Genuine Parts 13227300 cap meets OE specifications, offering reinforced polypropylene construction, an EPDM gasket, UV-stable finish, and a temperature range of −40°C to 85°C. It seals reliably, resists weathering, and fits necks of approximately 45 mm; verify neck diameter before purchase. Is it worth choosing? For GM owners seeking direct-fit durability and predictable performance, this cap is a practical, low-risk replacement that minimizes leaks and contamination while requiring minimal maintenance.
