Parts for your 1987 Suzuki Jimny-Coolant

Coolant for the 1987 Suzuki Jimny (SJ410/SJ413, a.k.a. Sierra)

Coolant absolutely is relevant to the 1987 Suzuki Jimny. Factory technical literature for the SJ-series confirms a liquid-cooled engine: see the Suzuki SJ413/Samurai Factory Service Manual (Cooling System section), the Suzuki SJ410 Service Manual, and the Gregory’s Service and Repair Manual for Suzuki Sierra 1983–1997. These sources specify an ethylene-glycol–based antifreeze/coolant for corrosion protection and temperature control in the water jacket, radiator and heater core.

On a 1987 Jimny, coolant does several big jobs: it keeps the engine at the right temp under load, resists boiling on hot days, prevents freezing in alpine conditions, and—most critically for longevity—protects alloy components from corrosion and scale. That’s why using a proper 50/50 mix of quality ethylene-glycol coolant with demineralised water is the go. Older SJ engines were designed around conventional “green” IAT coolant, mixing in modern long-life OAT types can cause additive clashes, so stick with one compatible chemistry and replace it regularly.

For servicing, most manuals for the SJ410/SJ413 recommend changing coolant about every 2 years or 40,000 km, whichever comes first. Fresh inhibitor keeps the water pump, radiator, and heater core happy, and reduces the chance of silicate drop-out or galvanic mischief inside the block. It’s smart to replace the radiator cap if it’s tired, and check the thermostat and hoses at the same time.

• Only drain and refill when the engine is stone cold. Pop the radiator tap (and block drain if fitted), catch and recycle the old coolant responsibly.
• Flush with clean water until it runs clear. For neglected systems, use a radiator flush that’s safe for aluminium, then rinse thoroughly.
• Refill with the correct premix (or mix in a clean container), turn the heater to hot, and run the engine to operating temp to purge air. Squeeze the top hose to help burp bubbles, then top up the radiator and the overflow bottle.
• After the first drive, recheck levels and look for leaks at hose clamps, the water pump weep hole and the heater core connections.

A Jimny of this era typically holds roughly several litres of coolant depending on engine and how fully it’s drained, always verify capacity and specifications in the model-appropriate manual listed above. Keeping on top of coolant pays off with steadier temps, better heater performance and a far longer-lived engine.

Popular questions

What coolant type suits a 1987 Jimny best?
For SJ410/SJ413 engines, a quality ethylene-glycol “green” IAT coolant mixed 50/50 with demineralised water matches the guidance in the Suzuki factory and Gregory’s manuals. Avoid mixing coolants of different chemistries, if switching types, fully flush first.

How often should the coolant be changed?
Every 2 years or around 40,000 km is a solid baseline for these older systems. Shorter intervals make sense if the vehicle tows, sees lots of dusty low-speed work, or the coolant looks discoloured before schedule.

How does one bleed air from the system?
Fill the radiator, set the heater to hot, run the engine to operating temperature, and gently squeeze the upper hose to help move trapped air. Top up the radiator once bubbles subside and ensure the overflow bottle sits at the correct mark after a short drive.