MILIPARTS Thermostat Housing Assembly for GM 3.0L/3.6L V6 — Aluminum Kit with Sensor & O‑Ring

MILIPARTS coolant thermostat housing assembly is a complete replacement unit that includes the thermostat, O-ring, temperature sensor, and mounting bolts for select 3.0L and 3.6L GM V6 vehicles.

This cast-aluminum thermostat housing is built to match fitment for many Chevrolet, Buick, GMC, Cadillac, Pontiac and Saturn V6 models from the late 2000s through the 2010s. It’s supplied as a ready-to-install kit so you can replace the factory housing and sensor in one service step, using the included fasteners and seal. The upgraded aluminum construction improves heat dissipation and resists corrosion and wear compared with typical plastic housings.

Which vehicles and engines does this thermostat housing fit?

This MILIPARTS assembly is made for GM V6 engines with 3.0L and 3.6L displacements across several model years. It covers a broad list of Chevrolet, Buick, GMC, Cadillac, Pontiac and Saturn vehicles—check the part numbers and model years before ordering to confirm compatibility.

• Chevrolet: Equinox, Impala, Malibu, Captiva Sport, and others (3.0L / 3.6L applications).
• Buick/Cadillac/GMC: LaCrosse, Allure, SRX, XTS, Terrain and related 3.0L/3.6L models.
• Pontiac/Saturn: G6, Torrent, Aura, Vue with V6 3.6L or 3.0L engines.
• Factory part references: cross-check numbers like 12638836, 12651113, 12689039, 1511077 when confirming fit.

What comes in the package and how does it simplify installation?

The unit ships as a complete thermostat housing kit so you don’t need to source small parts separately. This minimizes downtime and reduces the chance of missing a critical gasket or sensor during the repair.

• Included: thermostat, O-ring gasket, temperature sensor, and mounting bolts.
• Preassembled features that align with original mounting points for straightforward replacement.
• Works with standard tools; gasket and bolts provided to reduce missing-part issues.

How does the upgraded aluminum design affect performance and longevity?

Compared with many OEM plastic housings, an aluminum housing offers better thermal conductivity and improved resistance to heat-related deterioration. That can translate into a longer service life and reduced risk of failure in high-temperature or aggressive-coolant environments.

• Aluminum construction improves heat dissipation and reduces localized hot spots.
• Higher resistance to wear, corrosion, and high-temperature deformation than plastic.
• Precision casting reduces the likelihood of leaks when installed with the supplied O-ring.

Are any special tools or additional parts required for installation?

Installation is straightforward for a mechanically competent DIYer or a professional technician; the kit supplies most consumables you’ll need. Still, basic hand tools and proper torque settings are required, and coolant system bleed procedures should be followed after replacement.

• Tools: common hand tools (ratchet, sockets, torque wrench) and coolant catch basin.
• Consumables: coolant top-up or replacement and possibly thread locker if recommended by shop practice.
• Procedure: drain coolant to below the housing, replace unit, refill and bleed the cooling system per factory guidance.

Who this is for: This MILIPARTS thermostat housing assembly is aimed at owners and mechanics servicing GM V6 3.0L and 3.6L vehicles who want a direct-fit replacement with improved material durability. It's appropriate for routine maintenance, replacing a failed or leaking factory housing, or upgrading a plastic OEM unit to a more heat-resistant aluminum housing. Always verify model year, engine size, and OEM part cross-references before purchase to ensure proper fitment.