Mercury MerCruiser Quicksilver — Port Lower Manifold Cooling Hose — 32-864508
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Mercury MerCruiser 32-864508 Port Lower Manifold Cooling Hose
This molded hose routes coolant from the thermostat housing to the lower port exhaust-manifold connection in select MerCruiser closed-cooling systems. Verify the engine model, serial number, and cooling-system diagram before ordering.
Compatible Applications
- MerCruiser 5.0L MPI Alpha and Bravo, closed cooling
- MerCruiser 350 MAG MPI Alpha and Bravo
- MerCruiser 350 MAG MPI Horizon
- MerCruiser 350 MAG MPI MIE and Horizon MIE
- MerCruiser MX 6.2L MPI Horizon
- MerCruiser 6.2L MPI MIE EC
Part Details
- Brand: Mercury MerCruiser Quicksilver
- Part number: 32-864508, also referenced as 864508
- Product type: Engine cooling hose
- System: Closed cooling and exhaust-manifold cooling
- Location: Port-side lower exhaust manifold to thermostat housing
- Diagram position: Commonly item 9 on applicable diagrams; verify the engine-specific drawing
- UPC: 745061554580
Fitment Notice
Cooling-hose routing can vary by engine model, serial range, drive configuration, and exhaust arrangement. Confirm 32-864508 against the engine serial number and closed-cooling diagram.
When to Replace
Replace the hose if it is cracked, checked, hardened, swollen, abraded, or leaking coolant, or if deterioration is found during thermostat, manifold, or closed-cooling-system service.
Installation Notes
Install between the lower port exhaust-manifold fitting and the corresponding lower thermostat-housing port. Inspect the connections and clamps, route the port and starboard hoses to their matching ports, and secure the clamps according to the applicable MerCruiser service procedure.
Related Products
MerCruiser 864509 Starboard Lower Manifold Cooling Hose is the corresponding starboard-side hose. It is a different molded part, not a substitute for port-side 32-864508; verify fitment by serial number.
Technical FAQ
Is 32-864508 interchangeable with 32-864509? No. 864508 is the port-side hose and 864509 is the starboard-side hose.
Does this fit every 5.0L, 350 MAG, or 6.2L engine? No. Confirm that the engine uses the specified closed-cooling layout and check the serial-specific diagram.
Parts Desk Insights
Best use: Replacing the port lower-manifold hose in a compatible MerCruiser closed-cooling system.
Common mistake to avoid: Mixing up the port-side hose 32-864508 with the opposite-side hose 32-864509.
Sizing and fitment: No hose dimensions are specified here. Match the engine model, serial number, cooling-system diagram, and port-side connection before ordering.
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.