Parts for your 1987 Mitsubishi Pajero-Heater hose

1987 Mitsubishi Pajero Heater Hose — Purpose, Fitment and Service Tips

Technical sources confirm the 1987 Mitsubishi Pajero is fitted with heater hoses. The Mitsubishi Pajero Factory Service Manual (1983–1991, Heating and Cooling sections), Gregory’s Service and Repair Manual for Pajero/Montero (1983–1996), and the Haynes Pajero/Montero manual all describe a coolant‑fed heater core plumbed with an inlet and outlet rubber heater hose at the firewall. So, a heater hose is absolutely relevant for this model across common engines like the 4G54 2.6 petrol, 6G72 3.0 V6, and 4D56 2.5 diesel.

On a 1987 Pajero, the heater hoses carry hot engine coolant from the block to the heater core and back again, giving quick cabin warmth and dependable demisting on frosty mornings. They also help coolant circulate when the thermostat is closed, smoothing warm‑up. Being rubber, they age with heat, coolant chemistry, and any oil contamination. That’s why a tidy set of hoses and sound clamps is cheap insurance against roadside dramas and a wet passenger footwell.

Good servicing keeps them sweet:

• Inspect every service for soft spots, cracks, swelling at the ends, or crusty dried coolant trails.
• Squeeze-test when cold, any mushy or excessively hard feel is a red flag.
• Replace hoses showing perishing, oil soak, or if they’re older than 5–7 years.
• Use correct‑diameter, formed hoses where specified, avoid kinks. Quality constant‑tension clamps beat over‑tightened worm drives.
• When replacing: cool engine fully, drain to below heater‑core level, twist to break the seal (don’t pry on the firewall tubes), fit new hoses/clamps, refill with the correct Mitsubishi‑approved coolant mix, bleed air, and recheck for leaks after the first heat cycle.

A proper coolant flush on schedule helps the hoses and heater core last longer, and keeps the Pajero’s demister working a treat. If a hose lets go in the bush, a temporary heater‑core bypass (looping the engine stubs) can get it home, but it’s only a short‑term fix and you’ll lose cabin heat. For specifics, the factory manual’s Heating and Cooling chapters outline hose routing, clamp points, and bleed procedures used on Australian and New Zealand‑delivered Gen 1 Pajeros.

Popular questions about 1987 Mitsubishi Pajero heater hoses

How can someone tell a heater hose is failing on a 1987 Pajero?
Typical clues are a sweet coolant smell in the cabin, damp carpet under the dash, low coolant level, or dried pink/green tracks around hose ends. Hoses that feel spongy, show cracking, swelling at the clamp, or have oil contamination are due for replacement. After a drive, any weeping or steam near the firewall is another giveaway.

Can the heater be bypassed if a hose bursts?
Yes, as a roadside workaround the two engine‑bay heater pipes can be temporarily looped together with a short length of correct‑size hose and clamps. That stops coolant loss through the heater circuit. It’s only to get home or to a workshop—there’ll be no cabin heat, and the cooling system should be properly repaired and bled soon after.

What hose size does the 1987 Pajero use?
Most variants use common heater hose sizes like 16 mm (5/8 in) or 19 mm (3/4 in), but diameter and shapes vary by engine (4G54, 6G72, 4D56) and build. It’s best to match the original hose or check the factory manual or parts catalogue and use formed hoses where Mitsubishi specifies bends.