Important 2007 350Z Warning
This kit is not cataloged for the 2007–2008 Nissan 350Z with the VQ35HR engine.
The VQ35HR uses a different cooling-system and engine layout from the earlier VQ35DE. Buyers should not order MMHOSE-350Z-03BL for a 2007-and-newer 350Z based only on the vehicle name.
Important 2007 G35 Sedan Warning
The 2007 G35 Coupe carried over the earlier VQ35DE-based platform, while the redesigned 2007 G35 Sedan moved to the V36 chassis and VQ35HR engine.
Some catalogs group every 2007 G35 together. Verify the following before ordering:
- Coupe or sedan body style
- VQ35DE, RevUp or VQ35HR engine
- Original hose shapes
- Radiator inlet and outlet positions
- Smaller coolant-hose connections
For a 2007 sedan, use a VIN-based parts catalog or confirm fitment directly with Mishimoto.
Reinforced Silicone Construction
The hoses combine high-grade silicone with embedded heat-resistant fibers. Mishimoto rates them for temperatures up to 330°F and improved pressure tolerance compared with deteriorated factory rubber hoses.
Features include:
- Reinforced silicone construction
- Heat-resistant embedded fibers
- Maximum temperature rating of 330°F
- Four molded coolant hoses
- Factory-style routing
- Blue finish
- Improved heat and pressure tolerance
- Mishimoto Lifetime Warranty
The blue finish gives the VQ engine bay the traditional aftermarket treatment. It also makes tracing the hoses easier than identifying yet another black rubber line beneath that enormous intake plenum.
Hose Dimensions
| Hose | Inside diameter | Outside diameter |
|---|---|---|
| Hose 1 | 1.30 inches | 1.65 inches |
| Hose 2 | 1.30 inches | 1.65 inches |
| Hose 3 | 0.63 inches | 0.98 inches |
| Hose 4 | 0.31 inches | 0.55 inches |
The two large hoses serve the primary radiator circuit. The smaller molded hoses support additional cooling-system connections for the intended VQ35DE installation.
Match every hose against the original before removing multiple lines at once.
What’s Included?
The kit includes four blue silicone coolant hoses:
- Two large primary radiator hoses
- One medium coolant hose
- One small coolant hose
Clamp inclusion is not clearly established in the supplied description. Confirm the current package contents before ordering and use clamps appropriate for reinforced silicone hose.
Factory-Style Fit
MMHOSE-350Z-03BL is designed around the original VQ35DE radiator and coolant connections. It can also work with many direct-fit aluminum radiators that retain factory inlet and outlet placement.
Verify fitment carefully when the vehicle has:
- A VQ35HR engine conversion
- A custom aluminum radiator
- Turbocharger or supercharger plumbing
- Relocated coolant reservoir
- Aftermarket thermostat housing
- Modified coolant hard pipes
- Custom fan or shroud mounting
- An engine swap
When Should VQ35 Radiator Hoses Be Replaced?
Replace the hoses if you notice:
- Cracks around the connections
- Soft or swollen areas
- Coolant residue near a clamp
- A hose collapsing during cooldown
- Abrasion against a fan or bracket
- Oil contamination
- Recurring coolant loss
- Coolant odor after driving
- Temperature fluctuations
- Visible steam or leakage
Use our coolant-leak diagnostic guide if the source is unclear. Check the thermostat housing, water pump, radiator tanks and coolant bleeder connections—not only the most visible upper hose.
Installation Overview
Never open a hot VQ35 cooling system. Allow the engine to cool completely before removing the radiator cap.
A typical installation involves:
- Confirm the model, body style and engine version.
- Photograph and label the original hose routing.
- Drain the coolant into a suitable container.
- Remove intake components that restrict access.
- Replace one hose at a time where practical.
- Inspect every radiator and engine connection.
- Clean the sealing surfaces.
- Compare each silicone hose with its original counterpart.
- Route the hoses without kinks or contact with moving parts.
- Position the clamps behind the fitting beads.
- Refill with Nissan-compatible coolant.
- Bleed trapped air from the system.
- Confirm cooling-fan operation.
- Inspect every connection at operating temperature.
- Recheck the coolant level after the engine cools.
Follow our cooling-system flush procedure if the coolant is old, mixed or contaminated.
Bleeding the 350Z and G35 Cooling System
The VQ35 cooling system can trap air after service. An air pocket can produce unstable temperatures, poor heater output or overheating even when every new hose remains dry.
Use the factory bleeder point and fill the system slowly. Stop the engine if:
- The temperature rises rapidly
- The heater suddenly blows cold
- Coolant is forced from the reservoir
- The upper hose remains cold while the engine overheats
- Steam appears
- Cooling fans fail to operate
Our guide to a car overheating while the heater blows cold explains why trapped air and low coolant often create this symptom.
Inspect the Complete VQ35 Cooling System
New hoses cannot repair a failed thermostat, water pump, radiator or cooling fan. Inspect:
- Radiator core and end tanks
- Pressure cap
- Coolant reservoir
- Thermostat and housing
- Water pump
- Cooling fans and relays
- Bleeder valve
- Heater hoses
- Drive belts
- Coolant condition
Our complete cooling-system guide explains how the full circuit works.
Useful VQ-specific resources include:
- How to test Nissan 350Z cooling fans
- How to install a 350Z thermostat
- How to change a G35 thermostat
- Why a car overheats while driving
- Bad thermostat versus bad water pump
- Seven signs of a failing radiator
- When should you stop driving?
Frequently Asked Questions
What Nissan 350Z models does MMHOSE-350Z-03BL fit?
It fits compatible 2003–2006 Nissan 350Z Coupe and Roadster models with the VQ35DE or compatible RevUp cooling arrangement.
Does it fit a 2007 Nissan 350Z?
No. The 2007 350Z uses the VQ35HR engine and requires different cooling-system parts.
Does it fit the Infiniti G35?
It is commonly cataloged for 2003–2007 G35 applications, but the 2007 sedan requires special attention because it uses the newer VQ35HR configuration.
Does it fit a 2007 G35 Coupe?
It is listed for the carryover VQ35DE-powered G35 Coupe. Verify the engine and hose arrangement before ordering.
Does it fit a 2007 G35 Sedan?
Fitment should not be assumed. The redesigned 2007 sedan uses the VQ35HR and may require a different kit.
How many hoses are included?
The published dimensions identify four silicone coolant hoses.
Does it fit the VQ35HR?
No confirmed VQ35HR fitment should be claimed for this part number.
Will it work with an aluminum radiator?
It should fit a direct-replacement radiator retaining factory connection positions and diameters. Measure custom radiators before ordering.
Will silicone hoses fix an overheating 350Z?
Only when damaged, leaking or collapsing hoses caused the problem. Failed cooling fans, trapped air, a defective thermostat, radiator restriction or water-pump failure must be diagnosed separately.
Product Specifications
| Specification | Details |
|---|---|
| Brand | Mishimoto |
| Manufacturer part number | MMHOSE-350Z-03BL |
| Product type | Silicone coolant-hose kit |
| Color | Blue |
| Material | Reinforced silicone |
| Number of hoses | Four |
| Main hose inside diameter | 1.30 inches |
| Main hose outside diameter | 1.65 inches |
| Maximum temperature | 330°F |
| Primary Nissan fitment | 2003–2006 Nissan 350Z |
| Additional fitment | Compatible VQ35DE Infiniti G35 applications |
| Intended engine | VQ35DE/compatible RevUp |
| Warranty | Mishimoto Lifetime Warranty |
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