Mercury MerCruiser Quicksilver Cooling Hose — 32-864552
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Mercury MerCruiser Quicksilver Molded Cooling Hose — 32-864552
This is a genuine OEM molded cooling hose from Mercury Marine, connecting the thermostat housing to the upper exhaust manifold in select MerCruiser gasoline engine cooling systems. Molded to the exact curvature of the original routing, it installs without modification and restores proper coolant flow through your engine's closed cooling circuit.
Cooling hoses are a common service item — heat cycling, coolant chemistry, and time all cause rubber to harden, crack, or swell at the molded ends. When a cooling hose fails, the result is coolant loss and engine overheating. Using the correct OEM hose ensures the right wall thickness, bend geometry, and material compatibility for your engine.
Product Details
- Part Number: 864552 (full reference: 32-864552)
- Brand: Mercury Quicksilver
- Type: Molded engine cooling hose
- System: Engine cooling — thermostat housing to upper exhaust manifold
- Condition: New, genuine OEM
- GTIN / UPC: 745061554566
Compatible Applications
- Select MerCruiser sterndrive / inboard gasoline engines using the thermostat-housing-to-upper-manifold hose routing
- Compatibility varies by engine model, serial number range, and cooling configuration — confirm via engine serial number before ordering
Serial Number Fitment Notice
MerCruiser uses several similar molded hoses in the thermostat housing, exhaust manifold, heat exchanger, and drain areas. Always verify your engine serial number and cross-reference the cooling-system parts diagram to confirm 32-864552 is the correct hose for your specific connection point.
When to Replace
- Hose is cracked, hardened, swollen, or chafed
- Leaking or seeping at the molded ends or clamp points
- Visible deterioration or deformation from heat cycling
- Any coolant loss or engine overheating traced to this hose location
Installation Notes
- Allow the engine to cool completely before beginning service
- Note original hose routing and clamp positions before removal
- Inspect the thermostat-housing port and upper-manifold fitting for corrosion or damage
- Replace clamps if worn or corroded
- Verify the system is leak-free at operating temperature after installation
Related Parts
- Mercury MerCruiser 864579 Cooling Hose — Check Valve to Thermostat Housing
- Mercury MerCruiser Quicksilver Cooling Hose 864578 — Drain Fitting to Check Valve
- Mercury MerCruiser 865317T02 2-Bib Hose Fitting Assembly — Cool Fuel / Raw-Water Cooling
- Mercury MerCruiser Nylon Hose Clamp — 54-415825
- #3 SS Mini Hose Clamp 5/16"–9/16"
Parts Desk Insights
Best use: Order 32-864552 specifically when your cooling-system diagram shows the thermostat housing to upper exhaust manifold connection — that location is the key identifier. MerCruiser runs several similar-looking molded hoses in this area, and ordering the wrong one is a common mistake. The nearby hoses 864578 (drain fitting to check valve) and 864579 (check valve to thermostat housing) are frequent mix-ups — have your engine serial number ready and compare against the parts diagram before confirming your order. If you're not sure, our parts desk can cross-reference your serial number and diagram position to confirm the right part.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.