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Toyota Hilux 2001-2006 4WD and 2WD Workshop Manual Digital Download

I’ll assume you mean replacing and servicing the cooling/heater/vacuum hoses common to Toyota Hilux (applies to most 2WD and 4WD Hilux engines). The procedure below covers radiator upper/lower, bypass/heater hoses and typical vacuum/actuator hoses used on 4WD models. Follow each step in order. No questions.

Safety first
- Work only on a cold engine. Hot coolant is dangerous. Wait until cool to the touch.
- Park on a level surface, engage parking brake, chock wheels.
- Wear eye protection and gloves. Have a large drain pan and absorbent rags ready.
- If you’ll be under the vehicle, use jack stands — never rely on a jack alone.
- Disconnect negative battery only if you’ll be working around electric fans or wiring.
- Keep a fire extinguisher nearby if you’ll be using tools near fuel or electrical connections.

Tools and consumables needed
- 8–14 mm socket set and ratchet (for fan shroud, clamps).
- Flat screwdriver (slotted) and Phillips.
- Hose clamp pliers (spring-type) and regular pliers.
- Worm-drive clamp screwdriver or 6 mm socket for worm clamps.
- Pliers for pinch-off (hose pinch-off pliers) for heater hoses.
- Utility knife or hose cutter (sharp) / hose removal tool (curved pick).
- Drain pan (large) and funnels.
- Rags, gloves, safety glasses.
- Scraper or small wire brush to clean spigots.
- Penetrating oil (for seized clamps).
- Silicone grease (optional, for fitting hoses).
- Replacement hoses (OEM or equivalent EPDM/silicone coolant hoses) and replacement clamps (spring or quality worm/torque clamps). For vacuum hoses use vacuum-rated hose (small diameter).
- Coolant (correct Toyota type or equivalent, pre-mix or concentrate + distilled water).
- Radiator cap if old/brittle, new gasket if removed.

Common pitfalls to avoid (read first)
- Working on a hot engine (serious burn risk).
- Reusing old clamps or damaged crushed hoses.
- Cutting off hoses in a way that leaves a burr or too-short a hose — measure first.
- Overtightening worm clamps (can cut hose or crack plastic inlet).
- Not thoroughly bleeding the cooling system — leads to overheating.
- Damaging plastic radiator or heater outlet when prying a stuck hose.
- Using incorrect hose type (use coolant-rated hose, not generic vacuum hose for coolant).

Step‑by‑step: coolant hoses (upper/lower/bypass/heater)
1. Preparation
- Let engine cool. Place drain pan under radiator.
- Remove undercovers or fan shroud if needed for access (8–12mm bolts typical).
- Note hose routing and connection orientation — take a photo if necessary.

2. Drain coolant
- Open radiator cap only when cool.
- Open radiator drain cock/petcock (lower radiator outlet) or loosen lower hose connection to drain coolant into pan.
- For heater hose work you can often pinch off hoses and remove only the heater hose to minimize draining.

3. Release clamps
- Identify clamp type:
- Spring clamps: use hose clamp pliers to compress and slide clamp away from the fitting.
- Worm-drive clamps: use screwdriver or socket to loosen (turn CCW) and slide back.
- T-bolt or constant-tension clamps: use appropriate socket or screwdriver.
- If clamps are corroded/seized, spray penetrating oil, let soak, then use pliers/sockets.

4. Remove hose
- Twist hose by hand to break the seal. Pull straight off the spigot while twisting.
- If stuck: use a utility knife to carefully slice lengthwise off the hose (do not cut spigot). Alternatively use a dedicated hose removal tool or a thin flat screwdriver to pry gently while supporting the plastic spigot to avoid cracking it.
- For lower radiator hoses on some Hiluxes that are tight or routed under accessories, you may need to remove other components (fan shroud, alternator bracket) for clearance.

5. Inspect and clean fittings
- Inspect metal/plastic spigots for corrosion, cracks, groove damage.
- Clean mating surfaces with wire brush/rag, remove old rubber and clamp debris. Make sure grooves are smooth.
- If spigot is damaged, replace the affected component (radiator, water pump inlet, heater control valve) before reassembly.

6. Fit new hose
- Confirm hose part is correct (diameter, length, profile). OEM or high-quality EPDM or silicone hose recommended.
- Slide new clamp onto hose before fitting.
- Lightly smear a bit of coolant or silicone lube on the inside to ease fitting.
- Push hose fully onto the spigot so end line up with the spigot’s raised stop or groove.
- Position clamp 3–5 mm behind the spigot bead or directly over the bead depending on clamp type. For spring clamps, position over the bead; for worm clamps, ensure even seating.
- Tighten clamps: for worm clamps, snug until hose cannot be rotated by hand and no leak appears — do not crush. For spring clamps compress and release into position. If using T-bolt clamps, tighten to manufacturer spec but avoid over-clamping.

7. Refill and bleed cooling system
- Close drain cock. Fill radiator with correct coolant mixture.
- Start engine with radiator cap off and heater on max heat to circulate through heater core. Watch for bubbles escaping (air purging).
- Allow engine to reach normal operating temp and let thermostat open. Top up coolant as air bleeds out.
- Replace radiator cap once air is gone and level stable. Check expansion tank level and top as required.
- Run to temperature and recheck for leaks. After cooling, recheck coolant level again and top up.

8. Final checks
- Inspect all hose connections under load for leaks (engine at temp).
- After a short drive, recheck clamp tightness and coolant level.
- Inspect for hose rubbing/interference with belts or moving parts — secure hose with ties if necessary.

Vacuum and 4WD actuator hoses (general)
- Vacuum lines are smaller (typically 3–6 mm). Use vacuum-rated hose (latexes degrade fast — use proper vacuum hose).
- Depressurize system by turning key off; no fuel risk here but avoid rough handling of connectors.
- Remove quick-connect clips, note routing. Replace brittle hoses and connectors. Use the same ID hose or OEM equivalent.
- Check vacuum actuator diaphragms for tears; replace actuators if leaking.
- If replacing a hard-to-reach vacuum line, make sure you replicate routing exactly to avoid chafing or heat exposure.

Specific tool use notes
- Hose clamp pliers: squeeze handles to open spring clamp, slide back along hose, release in a safe position. Helps when clamps are tight or springy.
- Worm-drive screwdriver/socket: engage the screw head and turn CCW to loosen; turn slowly while maintaining pressure on the hose to avoid slippage.
- Pinch-off pliers: place upstream of the work area to reduce coolant loss on heater hoses; do not use sharp clamps that will cut hose if reusing.
- Utility knife/hose cutter: cut straight and clean. If you must cut for removal, cut along the hose length rather than through the spigot when possible.
- Hose removal tool: slide behind hose and pry off without twisting/plastic damage.

Replacement parts typically required
- New hoses (upper, lower, heater, bypass) as needed — replace any hose over 5 years old, or with cracks/bulging/soft spots.
- New clamps: replace spring clamps if corroded; consider replacing worm clamps with new stainless clamps.
- Coolant (correct spec for your Hilux engine).
- Radiator cap if old or pressure not maintained.
- If spigot/plastic fittings are cracked, replacement radiator/water pump/thermostat housing as necessary.

Extra tips and troubleshooting
- If you get a persistent leak at a clamp, remove clamp and hose, clean spigot, replace with a new clamp, fit hose further up or slightly rotate so clamp sits over the bead.
- If you see steam or white smoke after replacing hoses, stop and check coolant level — you likely have air trapped. Re-bleed.
- If engine overheats after replacement, double-check that bypass hoses and heater hoses are connected correctly (some engines have specific one-way flows).
- Replace hoses in pairs if one is old — e.g., replace both upper and lower at once if same age.
- For 4WD: inspect vacuum lines to front axle/differential — brittle lines cause 4WD engagement issues.

When to get professional help
- If plastic spigots or radiator ends are broken — these often require component replacement.
- If the lower hose connection is inaccessible or you must remove gearbox/engine mounts for access.
- If you suspect internal engine issues (water pump failure, head gasket) — symptoms like white smoke, milky oil, or continuous pressure loss require more advanced diagnosis.

That’s the complete shop-style walkthrough for replacing and servicing hoses on a Hilux (2WD/4WD). Follow safety steps, use correct replacement parts, and ensure the cooling system is properly bled before returning the vehicle to service.
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