► Hardie Hose | Silicone Coolant Hoses

High-Temperature Cooling-System Hose

When engine temperatures climb, coolant hose becomes part of the frontline between controlled fluid circulation & an unwanted workshop return. Hardie Hose | Silicone Coolant Hoses covers silicone radiator & heater hose for compatible automotive cooling systems operating around heat, coolant exposure & demanding under-bonnet conditions.

The collection spans two distinct jobs. Silicone radiator hose runs from 19mm to 102mm ID, while silicone heater hose covers 6mm to 25mm ID. Both Hardie Hose ranges are listed for temperatures from -53°C to +176°C, giving automotive workshops, fleet technicians & transport maintenance teams options for connections ranging from compact heater lines to substantially larger coolant-transfer points.

Working with a conventional cooling-system installation as well? Hardie Hose | Radiator Hoses covers additional radiator-hose options.

What Are Hardie Hose Silicone Coolant Hoses?

Silicone coolant hoses form flexible connections between compatible components carrying engine coolant. Depending on the system layout, they can be used around radiator circuits, heater circuits & other suitable coolant-transfer points.

Hardie Hose divides its silicone cooling range into two relevant constructions:

► Silicone Radiator Hose – exceeds SAE J20R1 & is listed for radiator, heater & other coolant-transfer hose applications.
► Silicone Heater Hose – exceeds SAE J20R3 & is intended for extreme-temperature & hostile engine environments where higher performance is required.

Hardie Hose lists its silicone radiator hose as resistant to weathering, ozone, heat & coolant deterioration. These characteristics make the range particularly relevant when temperature exposure is a major consideration.

For equipment used across the surrounding mechanical repair, browse Automotive & Mechanical.

Why Choose Hardie Hose Silicone Coolant Hoses?

A cold engine bay & a fully warmed vehicle create very different environments. Coolant hose repeatedly experiences those changes while vibration, radiant heat & fluid exposure continue throughout its service life.

Hardie Hose silicone radiator hose has a listed operating range of -53°C to +176°C & is supplied in 1000mm lengths. Silicone heater hose carries the same listed temperature range while covering the smaller diameters commonly encountered around heater-system connections.

Pressure capability isn't identical from one size to the next. Larger or smaller diameters can carry different ratings so the specification for the actual hose being installed matters more than a single figure taken from elsewhere in the range.

Common Applications

Different Connections Call for Different Hose

Picture a workshop dealing with two coolant repairs before lunch. A work ute needs attention around a compact heater connection while a second vehicle has deterioration along a much larger coolant line.

The fluid may be similar but the connection requirements aren't.

Hardie Hose silicone coolant hose can be considered for compatible:

► Radiator connections
► Heater circuits
► Coolant-transfer lines
► High-temperature engine environments
► Fleet vehicle cooling-system maintenance
► Transport workshop repairs
► Replacement of deteriorated coolant hose
► Preventative cooling-system maintenance
► Automotive applications requiring suitable silicone coolant hose

Where the source of a leak isn't obvious, Vehicle Diagnostic & Testing Tools can support the broader investigation.

Real automotive repairs rarely unfold exactly as expected. A Day With An Automotive Mechanic Peninsula looks at the practical environment surrounding workshop servicing & mechanical work.

Product Selection Guide

Radiator Hose or Heater Hose?

Begin with the component the hose needs to connect rather than treating every silicone coolant hose as the same product.

Silicone Radiator Hose Sizes & Pressure Ratings

Hardie Hose publishes the following specifications for its silicone radiator hose:

The progression makes one point especially clear: pressure rating changes with diameter.

Silicone Heater Hose Sizes & Pressure Ratings

Hardie Hose silicone heater hose covers:

A 6mm heater line & a 102mm radiator connection sit at opposite ends of this collection. Knowing where the hose belongs narrows the choice considerably.

For general workshop tools needed around hose removal, access & reassembly, see Hand Tools For Auto Repair.

Expert Tips

Let Coolant Residue Point You in the Right Direction

Fresh coolant tells you there's a problem. Dried staining can reveal where that problem has been developing over time.

Inspect hose ends, mating surfaces & nearby components before deciding which part has failed. Fluid can travel away from its original source so the lowest wet point isn't necessarily where the repair begins.

Tight engine compartments can make that investigation awkward. Inspection Mirrors & Lighting can help expose connections that can't be viewed directly.

A Shiny Patch Deserves Attention

Abrasion often leaves a different signature from age-related deterioration. A polished or locally worn section can indicate repeated contact with a bracket, cover or another component.

Engine movement matters here too. Clearance that looks acceptable with the engine stationary may change during operation.

Don't Borrow a Pressure Rating From Another Size

One of the easiest mistakes with a broad hose family is assuming the specification printed beside one diameter applies to all of them.

It doesn't here.

Hardie Hose publishes 108 psi for its 19mm silicone radiator hose & 16 psi for the 102mm version, with several ratings between those two sizes. The heater range also changes at larger diameters.

Use the figure attached to the hose actually being considered.

Keep Coolant & Transmission Circuits Separate

A hose's location under the bonnet doesn't define what should flow through it. Cooling circuits & transmission-fluid circuits perform different jobs & require suitable hose.

For automatic transmission cooler lines, Hardie Hose | Transmission Hoses covers dedicated 5/16" & 3/8" transmission cooler hose.

Use the Failed Hose as Evidence

Before throwing an old hose away, inspect where it deteriorated.

Damage concentrated beside the connection can send the inspection in one direction while a worn strip halfway along the hose suggests another. If several replacements have failed in approximately the same position, investigate the installation rather than assuming another fresh section will solve it.

Preventative thinking isn't limited to vehicle hoses. 7 Signs Your Power Tool Needs a Service Before It Fails on Site explores how early warning signs can help avoid equipment failure.

Planned Maintenance Beats a Coolant Trail

Fleet vehicles, work utes & transport equipment don't choose convenient moments to develop cooling-system trouble. Scheduled servicing gives technicians an opportunity to examine exposed coolant hose before deterioration becomes fluid loss.

Check accessible lines for surface damage, staining, unwanted contact & evidence of earlier repairs. If something looks questionable, investigate it while maintenance is already underway rather than waiting for the symptom to become more obvious.

For broader vehicle-maintenance requirements, Car Repair & Maintenance provides a useful next stop.

Seasonal preparation can create another natural inspection point. Spring Jobsite Prep Getting Your Gear Ready covers preparing equipment before workloads increase.

Look Past the Hose When the Vehicle Is Already Apart

Cooling-system work can expose other maintenance requirements that weren't obvious when the bonnet first opened. Access around the engine may reveal ageing components, fluid staining or servicing work worth addressing while the vehicle is available.

If routine engine maintenance is happening at the same time, Engine Oil Circulation & Filtration covers related lubrication & filtration requirements.

For workshops maintaining multiple vehicles, Fleet Management Tools | Tracking & Diagnostic supports the wider fleet-maintenance environment.